diff --git a/src/main/java/org/example/siljeun/domain/auth/controller/AuthController.java b/src/main/java/org/example/siljeun/domain/auth/controller/AuthController.java
index 0ee8150..24d458e 100644
--- a/src/main/java/org/example/siljeun/domain/auth/controller/AuthController.java
+++ b/src/main/java/org/example/siljeun/domain/auth/controller/AuthController.java
@@ -1,6 +1,7 @@
 package org.example.siljeun.domain.auth.controller;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.example.siljeun.domain.auth.dto.request.LoginRequest;
 import org.example.siljeun.domain.auth.dto.request.SignUpRequest;
 import org.example.siljeun.domain.auth.dto.response.LoginResponse;
@@ -17,6 +18,7 @@
 @RestController
 @RequestMapping("/auth")
 @RequiredArgsConstructor
+@Slf4j
 public class AuthController {
 
   private final AuthService authService;
@@ -33,6 +35,7 @@ public ResponseEntity<SignUpResponse> signUp(@RequestBody SignUpRequest request)
   @PostMapping("/login")
   public ResponseDto<LoginResponse> login(@RequestBody LoginRequest request) {
     try {
+      log.debug("----- 로그인 메서드 실행 -----");
       LoginResponse response = authService.login(request.username(), request.password());
       return ResponseDto.success("로그인 성공", response);
     } catch (Exception e) {
diff --git a/src/main/java/org/example/siljeun/domain/auth/service/AuthService.java b/src/main/java/org/example/siljeun/domain/auth/service/AuthService.java
index 98cbc21..e17f34b 100644
--- a/src/main/java/org/example/siljeun/domain/auth/service/AuthService.java
+++ b/src/main/java/org/example/siljeun/domain/auth/service/AuthService.java
@@ -24,8 +24,8 @@ public SignUpResponse signUp(SignUpRequest request) {
     String password = passwordEncoder.encode(request.password());
 
     // 회원 생성 및 저장
-    User user = new User(request.email(), request.username(), password, request.nickname(),
-        request.role(), request.provider());
+    User user = new User(request.email(), request.username(), password, request.name(),
+        request.nickname(), request.role(), request.provider());
     User savedUser = userRepository.save(user);
 
     return new SignUpResponse(savedUser.getId(), savedUser.getEmail(), savedUser.getUsername());
diff --git a/src/main/java/org/example/siljeun/domain/oauth/client/KakaoApiClient.java b/src/main/java/org/example/siljeun/domain/oauth/client/KakaoOAuthClient.java
similarity index 50%
rename from src/main/java/org/example/siljeun/domain/oauth/client/KakaoApiClient.java
rename to src/main/java/org/example/siljeun/domain/oauth/client/KakaoOAuthClient.java
index 3d1f01a..f76628c 100644
--- a/src/main/java/org/example/siljeun/domain/oauth/client/KakaoApiClient.java
+++ b/src/main/java/org/example/siljeun/domain/oauth/client/KakaoOAuthClient.java
@@ -1,16 +1,13 @@
 package org.example.siljeun.domain.oauth.client;
 
-import java.util.Map;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.example.siljeun.domain.oauth.dto.KakaoAccessToken;
 import org.example.siljeun.domain.oauth.dto.KakaoUserInfo;
-import org.example.siljeun.global.config.KakaoOAuthProperties;
-import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
-import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
-import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Component;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
@@ -18,56 +15,57 @@
 
 @Component
 @RequiredArgsConstructor
-public class KakaoApiClient {
+@Slf4j
+public class KakaoOAuthClient {
 
   private final RestTemplate restTemplate;
-  private final KakaoOAuthProperties properties;
 
+  // 현재 카카오 API 서버에서 인가 코드를 제공한 상태이다
+  // 서비스 서버가 인가 코드를 이용해 카카오 API 서버로 액세스 토큰을 요청한다
   public String getAccessToken(String code) {
     HttpHeaders headers = new HttpHeaders();
     headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
 
     MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
+    // 아래 4가지 값은 필수
     params.add("grant_type", "authorization_code");
-    params.add("client_id", "eaee0e144aeb9afef54d5c449448baea");
-    params.add("redirect_uri", "http://localhost:8080/oauth/kakao/callback");
-    params.add("code", code);
+    params.add("client_id", "eaee0e144aeb9afef54d5c449448baea"); // 카카오 REST API 키
+    params.add("redirect_uri", "http://localhost:8080/oauth/kakao/callback"); // 여기서 문제 발생?
+    params.add("code", code); // 인가 코드
 
     HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(params, headers);
 
-    ResponseEntity<Map<String, Object>> response = restTemplate.exchange(
+    // 명시한 URL로 (인가 코드를 담은) POST 요청을 보내면 카카오 API 서버에서 액세스 토큰을 응답한다
+    KakaoAccessToken response = restTemplate.postForEntity(
         "https://kauth.kakao.com/oauth/token",
-        HttpMethod.POST,
         request,
-        new ParameterizedTypeReference<>() {
-        }
-    );
+        KakaoAccessToken.class
+    ).getBody();
 
-    if (response.getStatusCode() != HttpStatus.OK || response.getBody() == null) {
-      throw new RuntimeException("카카오 Access Token 요청 실패");
-    }
+    log.debug("----- 액세스 토큰: {} -----", response.accessToken());
 
-    return response.getBody().get("access_token").toString();
+    return response.accessToken();
   }
 
+  // 서비스 서버가 카카오 인증 서버에 저장된 회원 정보를 요청한다
   public KakaoUserInfo getUserInfo(String accessToken) {
-    HttpHeaders headers = new HttpHeaders();
+    // HTTP 헤더 설정
+    final HttpHeaders headers = new HttpHeaders();
     headers.setBearerAuth(accessToken);
+    headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
 
-    HttpEntity<Void> request = new HttpEntity<>(headers);
+    // 설정한 HTTP 헤더를 이용해 요청 생성
+    final HttpEntity<Void> request = new HttpEntity<>(headers);
 
-    ResponseEntity<KakaoUserInfo> response = restTemplate.exchange(
+    // GET 메서드로 회원 정보를 요청한 후 KakaoUserInfo 객체에 담음
+    final KakaoUserInfo response = restTemplate.exchange(
         "https://kapi.kakao.com/v2/user/me",
         HttpMethod.GET,
         request,
         KakaoUserInfo.class
-    );
-
-    if (response.getStatusCode() != HttpStatus.OK || response.getBody() == null) {
-      throw new RuntimeException("카카오 사용자 정보 요청 실패");
-    }
+    ).getBody();
 
-    return response.getBody();
+    return response;
   }
 
-}
+}
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/oauth/client/NaverApiClient.java b/src/main/java/org/example/siljeun/domain/oauth/client/NaverApiClient.java
deleted file mode 100644
index 88c1713..0000000
--- a/src/main/java/org/example/siljeun/domain/oauth/client/NaverApiClient.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package org.example.siljeun.domain.oauth.client;
-
-public class NaverApiClient {
-
-}
diff --git a/src/main/java/org/example/siljeun/domain/oauth/controller/OAuthController.java b/src/main/java/org/example/siljeun/domain/oauth/controller/OAuthController.java
index ffc0e55..4c11678 100644
--- a/src/main/java/org/example/siljeun/domain/oauth/controller/OAuthController.java
+++ b/src/main/java/org/example/siljeun/domain/oauth/controller/OAuthController.java
@@ -1,8 +1,9 @@
 package org.example.siljeun.domain.oauth.controller;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.example.siljeun.domain.auth.dto.response.LoginResponse;
 import org.example.siljeun.domain.oauth.service.KakaoOAuthService;
-import org.example.siljeun.global.dto.ResponseDto;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -12,14 +13,21 @@
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/oauth")
+@Slf4j
 public class OAuthController {
 
   private final KakaoOAuthService kakaoOAuthService;
 
+  /*
+     1. 클라이언트가 카카오 로그인을 요청한다
+     2. /oauth/kakao/callback?code={code}로 리다이렉트된다
+     3. 이때 카카오에서 쿼리 스트링으로 인가 코드를 넘겨준다
+     4. 넘어온 인가 코드를 이용해서 카카오 로그인 API를 호출한다
+   */
   @GetMapping("/kakao/callback")
-  public ResponseEntity<?> kakaoCallback(@RequestParam String code) {
-    String jwt = kakaoOAuthService.kakaoLogin(code);
-    return ResponseEntity.ok(jwt);
+  public ResponseEntity<LoginResponse> kakaoCallback(@RequestParam String code) {
+    log.debug("---------- METHOD: kakaoCallback ----------");
+    return ResponseEntity.ok(kakaoOAuthService.kakaoLogin(code));
   }
 
 }
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoAccessToken.java b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoAccessToken.java
new file mode 100644
index 0000000..ad8ad55
--- /dev/null
+++ b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoAccessToken.java
@@ -0,0 +1,13 @@
+package org.example.siljeun.domain.oauth.dto;
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
+public record KakaoAccessToken(String tokenType,
+                               String accessToken,
+                               Integer expiresIn,
+                               String refreshToken,
+                               Integer refreshTokenExpiresIn) {
+
+}
diff --git a/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoAccount.java b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoAccount.java
new file mode 100644
index 0000000..0f271d1
--- /dev/null
+++ b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoAccount.java
@@ -0,0 +1,12 @@
+package org.example.siljeun.domain.oauth.dto;
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
+public record KakaoAccount(
+    KakaoProfile profile, // 프로필 정보(닉네임, 프로필 사진)
+    String email
+) {
+
+}
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoProfile.java b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoProfile.java
new file mode 100644
index 0000000..c85a06c
--- /dev/null
+++ b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoProfile.java
@@ -0,0 +1,12 @@
+package org.example.siljeun.domain.oauth.dto;
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
+public record KakaoProfile(
+    String nickname,
+    String profileImageUrl
+) {
+
+}
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoUserInfo.java b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoUserInfo.java
index f5c855f..f6660c1 100644
--- a/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoUserInfo.java
+++ b/src/main/java/org/example/siljeun/domain/oauth/dto/KakaoUserInfo.java
@@ -1,41 +1,12 @@
 package org.example.siljeun.domain.oauth.dto;
 
-import java.util.Map;
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-
-@Getter
-@AllArgsConstructor
-public class KakaoUserInfo implements OAuth2UserInfo {
-
-  private Map<String, Object> attributes;
-  private Map<String, Object> attributesAccount;
-  private Map<String, Object> attributesProfile;
-
-  public KakaoUserInfo(Map<String, Object> attributes) {
-    this.attributes = attributes;
-    this.attributesAccount = (Map<String, Object>) attributes.get("kakao_account");
-    this.attributesProfile = (Map<String, Object>) attributesAccount.get("profile");
-  }
-
-  @Override
-  public String getProvider() {
-    return "Kakao";
-  }
-
-  @Override
-  public String getProviderId() {
-    return attributes.get("id").toString();
-  }
-
-  @Override
-  public String getEmail() {
-    return attributesAccount.get("email").toString();
-  }
-
-  @Override
-  public String getNickname() {
-    return attributesProfile.get("nickname").toString();
-  }
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
+public record KakaoUserInfo(
+    Long id,                  // 회원 번호
+    KakaoAccount kakaoAccount // 카카오 계정 정보
+) {
 
 }
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/oauth/dto/NaverUserInfo.java b/src/main/java/org/example/siljeun/domain/oauth/dto/NaverUserInfo.java
deleted file mode 100644
index 3aff8c2..0000000
--- a/src/main/java/org/example/siljeun/domain/oauth/dto/NaverUserInfo.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package org.example.siljeun.domain.oauth.dto;
-
-public class NaverUserInfo {
-
-}
diff --git a/src/main/java/org/example/siljeun/domain/oauth/dto/OAuth2UserInfo.java b/src/main/java/org/example/siljeun/domain/oauth/dto/OAuth2UserInfo.java
deleted file mode 100644
index e47bd09..0000000
--- a/src/main/java/org/example/siljeun/domain/oauth/dto/OAuth2UserInfo.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package org.example.siljeun.domain.oauth.dto;
-
-import java.util.Map;
-
-public interface OAuth2UserInfo {
-
-  public Map<String, Object> getAttributes();
-
-  String getProvider();
-
-  String getProviderId();
-
-  String getEmail();
-
-  String getNickname();
-
-}
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/oauth/service/KakaoOAuthService.java b/src/main/java/org/example/siljeun/domain/oauth/service/KakaoOAuthService.java
index 8776f1c..cbd4cb0 100644
--- a/src/main/java/org/example/siljeun/domain/oauth/service/KakaoOAuthService.java
+++ b/src/main/java/org/example/siljeun/domain/oauth/service/KakaoOAuthService.java
@@ -1,40 +1,73 @@
 package org.example.siljeun.domain.oauth.service;
 
 import lombok.RequiredArgsConstructor;
-import org.example.siljeun.domain.oauth.client.KakaoApiClient;
+import lombok.extern.slf4j.Slf4j;
+import org.example.siljeun.domain.auth.dto.response.LoginResponse;
+import org.example.siljeun.domain.oauth.client.KakaoOAuthClient;
 import org.example.siljeun.domain.oauth.dto.KakaoUserInfo;
 import org.example.siljeun.domain.user.entity.User;
 import org.example.siljeun.domain.user.enums.Provider;
+import org.example.siljeun.domain.user.enums.Role;
 import org.example.siljeun.domain.user.repository.UserRepository;
 import org.example.siljeun.global.security.JwtUtil;
+import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 
 @Service
 @RequiredArgsConstructor
+@Slf4j
 public class KakaoOAuthService {
 
-  private final KakaoApiClient kakaoApiClient;
+  private final KakaoOAuthClient kakaoOAuthClient;
   private final UserRepository userRepository;
   private final JwtUtil jwtUtil;
+  private final PasswordEncoder passwordEncoder;
 
-  public String kakaoLogin(String code) {
-    // 1. 액세스 토큰 요청
-    String accessToken = kakaoApiClient.getAccessToken(code);
+  // 인가 코드를 이용해 카카오 로그인 API를 호출한다
+  public LoginResponse kakaoLogin(String code) {
+    // 1. 카카오에 인가 코드를 넘겨서 액세스 토큰을 획득한다
+    log.debug("----- 액세스 토큰 발급 -----");
+    final String accessToken = kakaoOAuthClient.getAccessToken(code);
 
-    // 2. 사용자 정보 요청
-    KakaoUserInfo userInfo = kakaoApiClient.getUserInfo(accessToken);
+    // 2. 카카오에 액세스 토큰을 넘겨서 카카오에 저장된 사용자 정보를 획득한다
+    log.debug("----- 사용자 정보 획득 -----");
+    final KakaoUserInfo userInfo = kakaoOAuthClient.getUserInfo(accessToken);
 
-    // 3. 회원 가입 또는 로그인 처리
-    User user = userRepository.findByEmail(userInfo.getEmail())
+    // 3. 해당 정보를 이용해 회원 가입 또는 로그인을 처리한다
+    log.debug("----- 회원 가입 또는 로그인 -----");
+    User user = userRepository.findByEmail(userInfo.kakaoAccount().email())
         .orElseGet(() -> registerUser(userInfo));
 
-    // 4. JWT 토큰 발급
-    return jwtUtil.createToken(user.getUsername());
+    // 4. 서비스 서버에 저장된 회원 정보를 이용해 JWT 토큰을 발급받는다
+    log.debug("----- JWT 토큰 발급 -----");
+    String token = jwtUtil.createToken(user.getUsername());
+
+    return new LoginResponse(token);
   }
 
   private User registerUser(KakaoUserInfo userInfo) {
-    User user = new User(userInfo.getEmail(), userInfo.getNickname(), Provider.KAKAO,
-        userInfo.getProviderId());
+    String username = "kakao" + userInfo.id();
+    String password = passwordEncoder.encode(username);
+    User user = new User(
+        userInfo.kakaoAccount().email(),
+        username,
+        password,
+        userInfo.kakaoAccount().profile().nickname(),
+        userInfo.kakaoAccount().profile().nickname(),
+        Role.USER,
+        Provider.KAKAO,
+        userInfo.id()
+    );
+    log.debug("--------------------회원 가입 메서드 실행--------------------");
+    log.debug("email: {}, username: {}, password: {}, name: {}, nickname: {}, id: {}",
+        userInfo.kakaoAccount().email(),
+        username,
+        password,
+        userInfo.kakaoAccount().profile().nickname(),
+        userInfo.kakaoAccount().profile().nickname(),
+        userInfo.id()
+    );
+
     return userRepository.save(user);
   }
 
diff --git a/src/main/java/org/example/siljeun/domain/oauth/service/NaverOAuthService.java b/src/main/java/org/example/siljeun/domain/oauth/service/NaverOAuthService.java
deleted file mode 100644
index 0fec45e..0000000
--- a/src/main/java/org/example/siljeun/domain/oauth/service/NaverOAuthService.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package org.example.siljeun.domain.oauth.service;
-
-import org.springframework.stereotype.Service;
-
-@Service
-public class NaverOAuthService {
-  
-}
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/payment/service/PaymentService.java b/src/main/java/org/example/siljeun/domain/payment/service/PaymentService.java
index 3f778fd..dfb99e6 100644
--- a/src/main/java/org/example/siljeun/domain/payment/service/PaymentService.java
+++ b/src/main/java/org/example/siljeun/domain/payment/service/PaymentService.java
@@ -5,6 +5,8 @@
 import org.example.siljeun.domain.payment.entity.Payment;
 import org.example.siljeun.domain.payment.repository.PaymentRepository;
 import org.example.siljeun.domain.reservation.service.ReservationService;
+import org.example.siljeun.domain.seat.enums.SeatStatus;
+import org.example.siljeun.domain.seatscheduleinfo.service.SeatScheduleInfoService;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -14,6 +16,7 @@ public class PaymentService {
 
   private final PaymentRepository paymentRepository;
   private final ReservationService reservationService;
+  private final SeatScheduleInfoService seatScheduleInfoService;
 
   @Transactional
   public void savePayment(PaymentConfirmRequestDto dto) {
@@ -24,6 +27,10 @@ public void savePayment(PaymentConfirmRequestDto dto) {
         .build();
 
     paymentRepository.save(payment);
+
+    seatScheduleInfoService.updateSeatScheduleInfoStatus(dto.getSeatScheduleInfoId(), SeatStatus.RESERVED);
+    seatScheduleInfoService.applySeatLockTTL(dto.getSeatScheduleInfoId(), SeatStatus.RESERVED);
+
     reservationService.save(dto.getUserId(), dto.getSeatScheduleInfoId());
   }
 }
diff --git a/src/main/java/org/example/siljeun/domain/reservation/controller/ReservationController.java b/src/main/java/org/example/siljeun/domain/reservation/controller/ReservationController.java
index 02e9343..34b1f58 100644
--- a/src/main/java/org/example/siljeun/domain/reservation/controller/ReservationController.java
+++ b/src/main/java/org/example/siljeun/domain/reservation/controller/ReservationController.java
@@ -44,13 +44,4 @@ public ResponseEntity<ResponseDto<ReservationInfoResponse>> findById(
     ReservationInfoResponse dto = reservationService.findById(username, reservationId);
     return ResponseEntity.ok(ResponseDto.success("예매 조회 성공", dto));
   }
-
-  @PostMapping()
-  public ResponseEntity<ResponseDto<Void>> createReservation(
-          @RequestBody @Valid ReservationCreateRequest reservationCreateRequest,
-          @AuthenticationPrincipal PrincipalDetails userDetails
-  ){
-    reservationService.createReservation(reservationCreateRequest, userDetails.getUserId());
-    return ResponseEntity.ok(ResponseDto.success("결제 진행하기", null));
-  }
 }
diff --git a/src/main/java/org/example/siljeun/domain/reservation/exception/ErrorCode.java b/src/main/java/org/example/siljeun/domain/reservation/exception/ErrorCode.java
index 6c0b852..90cf25a 100644
--- a/src/main/java/org/example/siljeun/domain/reservation/exception/ErrorCode.java
+++ b/src/main/java/org/example/siljeun/domain/reservation/exception/ErrorCode.java
@@ -18,6 +18,14 @@ public enum ErrorCode {
 
   // seatScheduleInfo
   NOT_FOUNT_SEAT_SCHEDULE_INFO(404, "해당 공연에 대한 좌석 정보가 존재하지 않습니다."),
+  ALREADY_SELECTED_SEAT(409, "이미 선점된 좌석입니다."),
+  SEAT_LIMIT_ONE_PER_USER(409, "1인당 1개의 좌석만 예약 가능합니다."),
+
+  // venue
+  NOT_FOUND_VENUE(404, "해당 공연장을 찾을 수 없습니다."),
+
+  // seat
+  SEAT_CAPACITY_EXCEEDED(400, "좌석 수가 공연장 수용 인원(capacity)을 초과했습니다."),
 
   // jwt
   UNAUTHORIZED(401, "토큰이 유효하지 않습니다."),
diff --git a/src/main/java/org/example/siljeun/domain/reservation/service/ReservationService.java b/src/main/java/org/example/siljeun/domain/reservation/service/ReservationService.java
index 23c38b2..442f7aa 100644
--- a/src/main/java/org/example/siljeun/domain/reservation/service/ReservationService.java
+++ b/src/main/java/org/example/siljeun/domain/reservation/service/ReservationService.java
@@ -13,9 +13,9 @@
 import org.example.siljeun.domain.seatscheduleinfo.repository.SeatScheduleInfoRepository;
 import org.example.siljeun.domain.seatscheduleinfo.entity.SeatScheduleInfo;
 import org.example.siljeun.domain.seat.enums.SeatStatus;
+import org.example.siljeun.domain.seatscheduleinfo.service.SeatScheduleInfoService;
 import org.example.siljeun.domain.user.entity.User;
 import org.example.siljeun.domain.user.repository.UserRepository;
-import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -29,16 +29,13 @@ public class ReservationService {
   private final ReservationRepository reservationRepository;
   private final UserRepository userRepository;
   private final WaitingQueueService waitingQueueService;
-  private final SeatScheduleInfoRepository seatScheduleInfoRepository;
-  private final RedisTemplate<String, String> redisTemplate;
-
+  private final SeatScheduleInfoService seatScheduleInfoService;
 
   @Transactional
   public void save(Long userId, Long seatScheduleInfoId) {
     User user = userRepository.findById(userId)
         .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND_USER));
-    SeatScheduleInfo seatScheduleInfo = seatScheduleInfoRepository.findById(seatScheduleInfoId)
-        .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUNT_SEAT_SCHEDULE_INFO));
+    SeatScheduleInfo seatScheduleInfo = seatScheduleInfoService.findById(seatScheduleInfoId);
 
     Reservation reservation = new Reservation(user, seatScheduleInfo);
     reservationRepository.save(reservation);
@@ -71,8 +68,11 @@ public void delete(String username, Long reservationId) {
       throw new CustomException(ErrorCode.INVALID_RESERVATION_USER);
     }
 
+    Long seatScheduleInfoId = reservation.getSeatScheduleInfo().getId();
     reservationRepository.delete(reservation);
-    reservation.getSeatScheduleInfo().updateSeatScheduleInfoStatus(SeatStatus.AVAILABLE);
+
+    seatScheduleInfoService.updateSeatScheduleInfoStatus(seatScheduleInfoId, SeatStatus.AVAILABLE);
+    seatScheduleInfoService.applySeatLockTTL(seatScheduleInfoId, SeatStatus.AVAILABLE);
   }
 
   public ReservationInfoResponse findById(String username, Long reservationId) {
@@ -87,45 +87,4 @@ public ReservationInfoResponse findById(String username, Long reservationId) {
 
     return ReservationInfoResponse.from(reservation);
   }
-
-  @Transactional
-  public void createReservation(ReservationCreateRequest reservationCreateRequest, Long userId){
-
-    //유저 확인
-    User user = userRepository.findById(userId)
-            .orElseThrow(() -> new EntityNotFoundException("유저를 찾을 수 없습니다."));
-
-    Long scheduleId = reservationCreateRequest.scheduleId();
-    //유저가 해당 회차에 선택한 좌석 검증
-    String redisSelectedKey = "user:scheduleSelected" + userId + ":" + scheduleId;
-    log.info("예매 정보 생성 시도 user : " + userId + "scheduleId : " + scheduleId + " key) " + redisSelectedKey );
-    String selectedId = redisTemplate.opsForValue().get(redisSelectedKey);
-
-    if (selectedId == null) {
-      throw new IllegalStateException("선택한 좌석이 없습니다.");
-    }
-
-    SeatScheduleInfo seatScheduleInfo = seatScheduleInfoRepository.findById(Long.valueOf(selectedId))
-            .orElseThrow(() -> new EntityNotFoundException("좌석 정보를 찾을 수 없습니다."));
-
-    //해당 좌석의 상태 검증
-    String redisStatusHashKey = "seatStatus:" + scheduleId;
-    Object redisStatusObj = redisTemplate.opsForHash().get(redisStatusHashKey, selectedId);
-
-    if (redisStatusObj == null || !redisStatusObj.toString().equals(SeatStatus.SELECTED.name())) {
-      throw new IllegalStateException("좌석 상태가 유효하지 않습니다. 다시 선택해주세요.");
-    }
-
-    //예매 정보 생성
-    Reservation reservation = new Reservation(user, seatScheduleInfo);
-    reservationRepository.save(reservation);
-
-    //좌석 상태 결제 진행 중으로 변경
-    seatScheduleInfo.updateSeatScheduleInfoStatus(SeatStatus.HOLD);
-    seatScheduleInfoRepository.save(seatScheduleInfo);
-    redisTemplate.opsForHash().put(redisStatusHashKey, selectedId, SeatStatus.HOLD.name());
-
-    //유저가 선점한 좌석 정보 - 결제 진행 상태일 때의 만료 시간 1시간
-    redisTemplate.expire(redisSelectedKey, Duration.ofMinutes(60));
-  }
 }
diff --git a/src/main/java/org/example/siljeun/domain/seat/enums/SeatStatus.java b/src/main/java/org/example/siljeun/domain/seat/enums/SeatStatus.java
index 9941c06..9bd5302 100644
--- a/src/main/java/org/example/siljeun/domain/seat/enums/SeatStatus.java
+++ b/src/main/java/org/example/siljeun/domain/seat/enums/SeatStatus.java
@@ -2,7 +2,7 @@
 
 public enum SeatStatus {
     BLOCKED,    //미판매
-    CANCELLED,  //취소
+    CANCELLED,  //취소 - 취소표는 특정 시간대에 한 번에 풀어놓는 상태를 고려하여 넣어놓았으나 현재 구현 상태에서는 사용하지 않음
     RESERVED,   //예매됨
     HOLD,       //결제 진행 중
     SELECTED,   //선택됨
diff --git a/src/main/java/org/example/siljeun/domain/seat/service/SeatService.java b/src/main/java/org/example/siljeun/domain/seat/service/SeatService.java
index 13e60b3..75a8ff0 100644
--- a/src/main/java/org/example/siljeun/domain/seat/service/SeatService.java
+++ b/src/main/java/org/example/siljeun/domain/seat/service/SeatService.java
@@ -1,6 +1,8 @@
 package org.example.siljeun.domain.seat.service;
 
 import lombok.RequiredArgsConstructor;
+import org.example.siljeun.domain.reservation.exception.CustomException;
+import org.example.siljeun.domain.reservation.exception.ErrorCode;
 import org.example.siljeun.domain.seat.dto.request.SeatCreateRequest;
 import org.example.siljeun.domain.seat.entity.Seat;
 import org.example.siljeun.domain.venue.entity.Venue;
@@ -15,18 +17,18 @@
 
 @Service
 @RequiredArgsConstructor
+@Transactional
 public class SeatService {
 
     private final VenueRepository venueRepository;
     private final SeatRepository seatRepository;
 
-    @Transactional
     public void createSeats(Long venueId, List<SeatCreateRequest> seatCreateRequests){
         Venue venue = venueRepository.findById(venueId)
-                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "해당 공연장을 찾을 수 없습니다."));         //Throw 예외 설정 필요
+                .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND_VENUE));
 
         if (seatCreateRequests.size() > venue.getSeatCapacity()) {
-            throw new IllegalArgumentException("좌석 수가 공연장 수용 인원(capacity)을 초과했습니다.");
+            throw new CustomException(ErrorCode.SEAT_CAPACITY_EXCEEDED);
         }
         //공연장 ID, 구역, 열, 번호를 바탕으로 고유하도록 설정하였으나
         //좌석 정보가 중복되는 경우를 다루지 않아 추후 리팩토링이 필요함
diff --git a/src/main/java/org/example/siljeun/domain/seatscheduleinfo/controller/SeatScheduleInfoController.java b/src/main/java/org/example/siljeun/domain/seatscheduleinfo/controller/SeatScheduleInfoController.java
index e19e85f..f7e8a2d 100644
--- a/src/main/java/org/example/siljeun/domain/seatscheduleinfo/controller/SeatScheduleInfoController.java
+++ b/src/main/java/org/example/siljeun/domain/seatscheduleinfo/controller/SeatScheduleInfoController.java
@@ -1,27 +1,25 @@
 package org.example.siljeun.domain.seatscheduleinfo.controller;
 
+import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
+import org.example.siljeun.domain.seatscheduleinfo.dto.request.SeatScheduleUpdateStatusRequest;
 import org.example.siljeun.domain.seatscheduleinfo.service.SeatScheduleInfoService;
 import org.example.siljeun.global.dto.ResponseDto;
 import org.example.siljeun.global.security.PrincipalDetails;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.*;
 
 import java.util.Map;
 
 @Controller
 @RequiredArgsConstructor
-@RequestMapping("/schedules/{scheduleId}")
 public class SeatScheduleInfoController {
 
     private final SeatScheduleInfoService seatScheduleInfoService;
 
-    @PostMapping("/seat-schedule-infos")
+    @PostMapping("/schedules/{scheduleId}/seat-schedule-infos")
     public ResponseEntity<ResponseDto<Void>> forceSeatScheduleInfoInRedis(
             @PathVariable Long scheduleId
     )
@@ -30,7 +28,7 @@ public ResponseEntity<ResponseDto<Void>> forceSeatScheduleInfoInRedis(
         return ResponseEntity.ok(ResponseDto.success("Redis 적재 완료 scheduleId : " + scheduleId, null));
     }
 
-    @PostMapping("/seat-schedule-infos/{seatScheduleInfoId}")
+    @PostMapping("/schedules/{scheduleId}/seat-schedule-infos/{seatScheduleInfoId}")
     public ResponseEntity<ResponseDto<Void>> selectSeat(
             @PathVariable Long scheduleId,
             @PathVariable Long seatScheduleInfoId,
@@ -40,10 +38,18 @@ public ResponseEntity<ResponseDto<Void>> selectSeat(
         return ResponseEntity.ok(ResponseDto.success( "좌석이 선택되었습니다. seatScheduleInfoId : " + seatScheduleInfoId.toString(), null));
     }
 
-    @GetMapping("/seat-schedule-infos")
+    @GetMapping("/schedules/{scheduleId}/seat-schedule-infos")
     public ResponseEntity<Map<String, String>> getSeatScheduleInfos(
             @PathVariable Long scheduleId
     ) {
         return ResponseEntity.ok(seatScheduleInfoService.getSeatStatusMap(scheduleId));
     }
+
+//    @PatchMapping("/seat-schedule-infos")
+//    public ResponseEntity<ResponseDto<Void>> updateSeatScheduleInfoStatus(
+//            @RequestBody @Valid SeatScheduleUpdateStatusRequest seatScheduleRequest
+//    ){
+//        seatScheduleInfoService.updateSeatSchedulerInfoStatus(seatScheduleRequest.seatScheduleInfoId(), seatScheduleRequest.status());
+//        return ResponseEntity.ok(ResponseDto.success("좌석의 상태가 변경되었습니다.", null));
+//    }
 }
diff --git a/src/main/java/org/example/siljeun/domain/seatscheduleinfo/scheduler/SeatExpirationScheduler.java b/src/main/java/org/example/siljeun/domain/seatscheduleinfo/scheduler/SeatExpirationScheduler.java
new file mode 100644
index 0000000..4f27231
--- /dev/null
+++ b/src/main/java/org/example/siljeun/domain/seatscheduleinfo/scheduler/SeatExpirationScheduler.java
@@ -0,0 +1,87 @@
+package org.example.siljeun.domain.seatscheduleinfo.scheduler;
+
+import lombok.RequiredArgsConstructor;
+import org.example.siljeun.domain.seat.enums.SeatStatus;
+import org.example.siljeun.domain.seatscheduleinfo.entity.SeatScheduleInfo;
+import org.example.siljeun.domain.seatscheduleinfo.repository.SeatScheduleInfoRepository;
+import org.example.siljeun.global.util.RedisKeyProvider;
+import org.springframework.data.redis.core.RedisCallback;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+@Component
+@RequiredArgsConstructor
+public class SeatExpirationScheduler {
+
+    private final RedisTemplate<String, String> redisTemplate;
+    private final SeatScheduleInfoRepository seatScheduleInfoRepository;
+
+    @Scheduled(fixedDelay = 60_000)
+    public void expireSeatsToAvailable() {
+        long now = System.currentTimeMillis();
+        expireByStatus(SeatStatus.SELECTED, now);
+        expireByStatus(SeatStatus.HOLD, now);
+    }
+
+    private void expireByStatus(SeatStatus status, long nowMillis) {
+        String zsetKey = RedisKeyProvider.trackExpiresKey(status.name());
+        //상태-> 좌석Id들 1, 2, 3, 4,..... + 만료 시간
+        //중에서 만료 시간이 지금 이전인 것들 조회
+        Set<String> expiredIds = redisTemplate
+                .opsForZSet()
+                .rangeByScore(zsetKey, 0, nowMillis);
+        if (expiredIds == null || expiredIds.isEmpty()) {
+
+            return;
+        }
+
+        //만료 시간이 지난 Id들을 Long 타입으로 변경하고 실제 객체를 가져와서 상태를 변경 후 저장
+        List<Long> ids = expiredIds.stream()
+                .map(Long::valueOf)
+                .toList();
+        List<SeatScheduleInfo> infos = seatScheduleInfoRepository.findAllById(ids);
+        infos.forEach(info -> info.updateSeatScheduleInfoStatus(SeatStatus.AVAILABLE));
+        seatScheduleInfoRepository.saveAll(infos);
+
+        final Map<String, Map<Object,Object>> hashBatch = new HashMap<>();
+        for (SeatScheduleInfo info : infos) {
+            String hashKey = RedisKeyProvider.seatStatusKey(info.getSchedule().getId());
+            hashBatch
+                    .computeIfAbsent(hashKey, k -> new HashMap<>())
+                    .put(info.getId().toString(), SeatStatus.AVAILABLE.name());
+        }
+
+        RedisCallback<Object> pipelineWork = connection -> {
+            // ZSET 제거
+            connection.zRem(
+                    zsetKey.getBytes(),
+                    expiredIds.stream()
+                            .map(String::getBytes)
+                            .toArray(byte[][]::new)
+            );
+
+            // 해시 업데이트
+            for (Map.Entry<String, Map<Object,Object>> e : hashBatch.entrySet()) {
+                byte[] hashKey = redisTemplate.getStringSerializer().serialize(e.getKey());
+                Map<byte[], byte[]> serialized = new HashMap<>();
+                e.getValue().forEach((field, value) ->
+                        serialized.put(
+                                redisTemplate.getStringSerializer().serialize(field.toString()),
+                                redisTemplate.getStringSerializer().serialize(value.toString())
+                        )
+                );
+                connection.hMSet(hashKey, serialized);
+            }
+
+            return null;
+        };
+
+        redisTemplate.executePipelined(pipelineWork);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/domain/seatscheduleinfo/service/SeatScheduleInfoService.java b/src/main/java/org/example/siljeun/domain/seatscheduleinfo/service/SeatScheduleInfoService.java
index 56cc1d9..85baad7 100644
--- a/src/main/java/org/example/siljeun/domain/seatscheduleinfo/service/SeatScheduleInfoService.java
+++ b/src/main/java/org/example/siljeun/domain/seatscheduleinfo/service/SeatScheduleInfoService.java
@@ -3,6 +3,8 @@
 import jakarta.persistence.EntityNotFoundException;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.example.siljeun.domain.reservation.exception.CustomException;
+import org.example.siljeun.domain.reservation.exception.ErrorCode;
 import org.example.siljeun.domain.schedule.entity.Schedule;
 import org.example.siljeun.domain.schedule.repository.ScheduleRepository;
 import org.example.siljeun.domain.seat.entity.Seat;
@@ -11,9 +13,11 @@
 import org.example.siljeun.domain.seatscheduleinfo.entity.SeatScheduleInfo;
 import org.example.siljeun.domain.seat.enums.SeatStatus;
 import org.example.siljeun.global.lock.DistributedLock;
+import org.example.siljeun.global.util.RedisKeyProvider;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.server.ResponseStatusException;
 
 import java.time.Duration;
@@ -31,57 +35,62 @@ public class SeatScheduleInfoService {
     @DistributedLock(key = "'seat:' + #seatScheduleInfoId")
     public void selectSeat(Long userId, Long scheduleId, Long seatScheduleInfoId) {
 
+        //예외 상황 처리
         SeatScheduleInfo seatScheduleInfo = seatScheduleInfoRepository.findById(seatScheduleInfoId).
-                orElseThrow(() -> new EntityNotFoundException("해당 회차별 좌석 정보가 존재하지 않습니다."));
+                orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUNT_SEAT_SCHEDULE_INFO));
 
         Schedule schedule = seatScheduleInfo.getSchedule();
-
         if(schedule.getTicketingStartTime().isAfter(LocalDateTime.now())){
-            log.info("예매 미오픈.");
-            throw new ResponseStatusException(HttpStatus.FORBIDDEN, "예매 불가능한 시간입니다. 예매 오픈 시간 : " + schedule.getTicketingStartTime());
+            throw new CustomException(ErrorCode.NOT_TICKETING_TIME);
         }
 
         if (!seatScheduleInfo.isAvailable()) {
-            log.info("이미 선점된 좌석입니다.");
-            throw new ResponseStatusException(HttpStatus.CONFLICT, "이미 선점된 좌석입니다.");
+            throw new CustomException(ErrorCode.ALREADY_SELECTED_SEAT);
         }
 
+        String redisSelectedKey = RedisKeyProvider.userSelectedSeatKey(userId, scheduleId);
+        if (Boolean.TRUE.equals(redisTemplate.hasKey(redisSelectedKey))) {
+            throw new CustomException(ErrorCode.SEAT_LIMIT_ONE_PER_USER);
+        }
+
+        //DB 상태 변경
         seatScheduleInfo.updateSeatScheduleInfoStatus(SeatStatus.SELECTED);
         seatScheduleInfoRepository.save(seatScheduleInfo);
 
-        //userId와 schedule Id가 key이고 seatSchduleInfoId로 구성된 value인 형태로 저장
-        String redisSelectedKey = "user:scheduleSelected" + userId + ":" + scheduleId;
+        //유저가 선점한 좌석을 Redis에 저장 (정보 조회용)
+        redisTemplate.opsForValue()
+                .set(redisSelectedKey, seatScheduleInfoId.toString());
+        redisTemplate.expire(redisSelectedKey, Duration.ofMinutes(5));
 
-        if (Boolean.TRUE.equals(redisTemplate.hasKey(redisSelectedKey))) {
-            throw new ResponseStatusException(HttpStatus.CONFLICT, "1인당 1개의 좌석만 예약 가능합니다.");
-        }
+        //TTL 관리를 위한 키 생성
+        String redisLockKey = RedisKeyProvider.seatOccupyKey(seatScheduleInfoId);
+        redisTemplate.opsForValue().set(redisLockKey, userId.toString());
 
-        redisTemplate.opsForValue().set(redisSelectedKey, seatScheduleInfoId.toString());
-        redisTemplate.expire(redisSelectedKey, Duration.ofMinutes(5));
+        //Redis 상태 변경
+        updateSeatScheduleInfoStatusInRedis(scheduleId, seatScheduleInfoId, SeatStatus.SELECTED);
 
-        //seatScheduleInfoId의 seatStatus 상태 변경
-        String redisHashKey = "seatStatus:" + scheduleId;
-        redisTemplate.opsForHash().put(redisHashKey, seatScheduleInfoId.toString(), SeatStatus.SELECTED.name());
-        log.info("redisHashKey : " + redisHashKey + " = " + " redisSelectedKey : " + redisSelectedKey);
+        //TTL 적용
+        applySeatLockTTL(seatScheduleInfoId, SeatStatus.SELECTED);
     }
 
     public Map<String, String> getSeatStatusMap(Long scheduleId) {
 
         Schedule schedule = scheduleRepository.findById(scheduleId)
-                .orElseThrow(() -> new EntityNotFoundException("해당 회차가 존재하지 않습니다."));
+                .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND_SCHEDULE));
 
-        List<SeatScheduleInfo> seatScheduleInfos =
-                seatScheduleInfoRepository.findAllBySchedule(schedule);
+        List<SeatScheduleInfo> seatScheduleInfos = seatScheduleInfoRepository.findAllBySchedule(schedule);
+        if(seatScheduleInfos.isEmpty()){
+            throw new CustomException(ErrorCode.NOT_FOUNT_SEAT_SCHEDULE_INFO);
+        }
 
         List<String> fieldKeys = seatScheduleInfos.stream()
                 .map(info -> info.getId().toString())
                 .toList();
 
-        String redisHashKey = "seatStatus:" + scheduleId;
-        List<Object> redisStatuses = redisTemplate.opsForHash().multiGet(redisHashKey, new ArrayList<>(fieldKeys));
+        String redisKey = RedisKeyProvider.seatStatusKey(scheduleId);
+        List<Object> redisStatuses = redisTemplate.opsForHash().multiGet(redisKey, new ArrayList<>(fieldKeys));
 
         Map<String, String> seatStatusMap = new HashMap<>();
-
         for (int i = 0; i < seatScheduleInfos.size(); i++) {
             SeatScheduleInfo info = seatScheduleInfos.get(i);
             Object redisStatusObj = redisStatuses.get(i);
@@ -90,7 +99,7 @@ public Map<String, String> getSeatStatusMap(Long scheduleId) {
                     ? redisStatusObj.toString()
                     : seatScheduleInfos.get(i).getStatus().name();
 
-            seatStatusMap.put("seatScheduleInfo-" + info.getId().toString(), status);
+            seatStatusMap.put(info.getId().toString(), status);
         }
 
         return seatStatusMap;
@@ -98,11 +107,11 @@ public Map<String, String> getSeatStatusMap(Long scheduleId) {
 
     public void forceSeatScheduleInfoInRedis(Long scheduleId){
         Schedule schedule = scheduleRepository.findById(scheduleId)
-                .orElseThrow(() -> new EntityNotFoundException("해당 회차가 존재하지 않습니다."));
+                .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND_SCHEDULE));
 
         List<SeatScheduleInfo> seatInfos = seatScheduleInfoRepository.findAllBySchedule(schedule);
 
-        String redisHashKey = "seatStatus:" + schedule.getId();
+        String redisHashKey = RedisKeyProvider.seatStatusKey(scheduleId);
         Map<String, String> seatStatusMap = new HashMap<>();
 
         for (SeatScheduleInfo seat : seatInfos) {
@@ -111,4 +120,54 @@ public void forceSeatScheduleInfoInRedis(Long scheduleId){
 
         redisTemplate.opsForHash().putAll(redisHashKey, seatStatusMap);
     }
+    @Transactional
+    public void updateSeatScheduleInfoStatus(Long seatScheduleInfoId, SeatStatus seatStatus){
+        SeatScheduleInfo seatScheduleInfo = seatScheduleInfoRepository.findById(seatScheduleInfoId)
+                .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUNT_SEAT_SCHEDULE_INFO));
+        seatScheduleInfo.updateSeatScheduleInfoStatus(seatStatus);
+
+        Long scheduleId = seatScheduleInfo.getSchedule().getId();
+        updateSeatScheduleInfoStatusInRedis(scheduleId, seatScheduleInfoId, seatStatus);
+    }
+
+    public void updateSeatScheduleInfoStatusInRedis(Long scheduleId, Long seatScheduleInfoId, SeatStatus seatStatus){
+        String redisKey = RedisKeyProvider.seatStatusKey(scheduleId);
+        String fieldKey = seatScheduleInfoId.toString();
+        redisTemplate.opsForHash().put(redisKey, fieldKey, seatStatus.name());
+    }
+
+    public void applySeatLockTTL(Long seatScheduleInfoId, SeatStatus seatStatus){
+        String member = seatScheduleInfoId.toString();
+
+        String seatLockkey = RedisKeyProvider.seatOccupyKey(seatScheduleInfoId);
+        String zsetSelectedKey = RedisKeyProvider.trackExpiresKey(SeatStatus.SELECTED.name());
+        String zsetHoldKey = RedisKeyProvider.trackExpiresKey(SeatStatus.HOLD.name());
+
+        Duration ttl = null;
+        long nowMillis = System.currentTimeMillis();
+
+        redisTemplate.opsForZSet().remove(zsetSelectedKey, member);
+        redisTemplate.opsForZSet().remove(zsetHoldKey, member);
+
+        switch(seatStatus){
+            case SELECTED:
+                ttl = Duration.ofMinutes(5);
+                redisTemplate.expire(seatLockkey, ttl);
+                redisTemplate.opsForZSet().add(zsetSelectedKey, member, nowMillis+ttl.toMillis());
+                break;
+            case HOLD:
+                ttl = Duration.ofMinutes(60);
+                redisTemplate.expire(seatLockkey, ttl);
+                redisTemplate.opsForZSet().add(zsetHoldKey, member, nowMillis+ttl.toMillis());
+                break;
+            default:
+                redisTemplate.persist(seatLockkey);
+                break;
+        }
+    }
+
+    public SeatScheduleInfo findById(Long seatScheduleInfoId){
+        return seatScheduleInfoRepository.findById(seatScheduleInfoId)
+                .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUNT_SEAT_SCHEDULE_INFO));
+    }
 }
diff --git a/src/main/java/org/example/siljeun/domain/user/entity/User.java b/src/main/java/org/example/siljeun/domain/user/entity/User.java
index 14ec94f..575d8c1 100644
--- a/src/main/java/org/example/siljeun/domain/user/entity/User.java
+++ b/src/main/java/org/example/siljeun/domain/user/entity/User.java
@@ -51,23 +51,31 @@ public class User extends BaseEntity {
   @Column(nullable = false)
   private Provider provider;
 
-  private String providerId;
+  private Long providerId;
 
   private LocalDateTime deletedAt;
 
-  public User(String email, String username, String password, String nickname, Role role,
-      Provider provider) {
+  // 로컬 회원 가입용 생성자
+  public User(String email, String username, String password, String name, String nickname,
+      Role role, Provider provider) {
     this.email = email;
     this.username = username;
     this.password = password;
+    this.name = name;
     this.nickname = nickname;
     this.role = role;
     this.provider = provider;
   }
 
-  public User(String email, String nickname, Provider provider, String providerId) {
+  // 소셜 회원 가입용 생성자
+  public User(String email, String username, String password, String name, String nickname,
+      Role role, Provider provider, Long providerId) {
     this.email = email;
+    this.username = username;
+    this.password = password;
+    this.name = name;
     this.nickname = nickname;
+    this.role = role;
     this.provider = provider;
     this.providerId = providerId;
   }
diff --git a/src/main/java/org/example/siljeun/global/config/RedisConfig.java b/src/main/java/org/example/siljeun/global/config/RedisConfig.java
index 4e97908..9097b30 100644
--- a/src/main/java/org/example/siljeun/global/config/RedisConfig.java
+++ b/src/main/java/org/example/siljeun/global/config/RedisConfig.java
@@ -6,6 +6,7 @@
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
 import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
@@ -59,11 +60,14 @@ public RedisTemplate<String, Object> redisJsonTemplate(RedisConnectionFactory co
   }
 
   @Bean
+  @Primary
   RedisTemplate<String, String> redisStringTemplate(RedisConnectionFactory connectionFactory) {
     RedisTemplate<String, String> template = new RedisTemplate<>();
     template.setConnectionFactory(connectionFactory);
     template.setKeySerializer(new StringRedisSerializer());
     template.setValueSerializer(new StringRedisSerializer());
+    template.setHashKeySerializer(new StringRedisSerializer());
+    template.setHashValueSerializer(new StringRedisSerializer());
     return template;
   }
 }
diff --git a/src/main/java/org/example/siljeun/global/config/SecurityConfig.java b/src/main/java/org/example/siljeun/global/config/SecurityConfig.java
index 9afd186..70a80e3 100644
--- a/src/main/java/org/example/siljeun/global/config/SecurityConfig.java
+++ b/src/main/java/org/example/siljeun/global/config/SecurityConfig.java
@@ -31,14 +31,17 @@ public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Excepti
         .sessionManagement(session -> session
             .sessionCreationPolicy(SessionCreationPolicy.STATELESS))
         .authorizeHttpRequests(auth -> auth
-            .requestMatchers("/auth/**", "/oauth2/**", "/login/**", "/ws/**", "/ws","/checkout.html","/payments","/success.html").permitAll()
+            .requestMatchers("/auth/**", "/oauth/**", "/oauth2/**", "/login/**", "/ws/**", "/ws",
+                "/checkout.html", "/payments", "/success.html").permitAll()
             .anyRequest().authenticated()
         )
-//        .oauth2Login(oauth2 -> oauth2
-//            .successHandler(customOAuth2SuccessHandler)
-//            .defaultSuccessUrl("/auth/oauth2/success", true)
-//            .failureUrl("/auth/oauth2/failure")
-//        )
+        .oauth2Login(oauth2 -> oauth2
+            .successHandler(customOAuth2SuccessHandler)
+            .defaultSuccessUrl("/auth/oauth2/success")
+            .failureUrl("/auth/oauth2/failure")
+        )
+//        .formLogin(form -> form
+//            .loginPage("/login"))
         .addFilterBefore(new JwtAuthenticationFilter(jwtUtil, userDetailsService),
             UsernamePasswordAuthenticationFilter.class);
 
diff --git a/src/main/java/org/example/siljeun/global/security/CustomOAuth2SuccessHandler.java b/src/main/java/org/example/siljeun/global/security/CustomOAuth2SuccessHandler.java
index dff18e0..8a32da3 100644
--- a/src/main/java/org/example/siljeun/global/security/CustomOAuth2SuccessHandler.java
+++ b/src/main/java/org/example/siljeun/global/security/CustomOAuth2SuccessHandler.java
@@ -6,6 +6,7 @@
 import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
 import org.springframework.stereotype.Component;
@@ -14,6 +15,7 @@
 
 @Component
 @RequiredArgsConstructor
+@Slf4j
 public class CustomOAuth2SuccessHandler implements AuthenticationSuccessHandler {
 
   private final JwtUtil jwtUtil;
@@ -21,6 +23,8 @@ public class CustomOAuth2SuccessHandler implements AuthenticationSuccessHandler
   @Override
   public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
       Authentication authentication) throws IOException, ServletException {
+    log.debug("----- 로그인 성공 -----");
+
     // principal에서 사용자 정보 추출
     OAuth2User oAuth2User = (OAuth2User) authentication.getPrincipal();
     String username = "kakao_" + oAuth2User.getAttribute("id").toString();
@@ -41,6 +45,9 @@ public void onAuthenticationSuccess(HttpServletRequest request, HttpServletRespo
     response.setStatus(HttpServletResponse.SC_OK);
     response.getWriter().write("{\"message\": \"Login successful\"}");
     response.getWriter().flush();
+
+    // 기본 경로로 리다이렉트
+    response.sendRedirect("/");
   }
 
 }
diff --git a/src/main/java/org/example/siljeun/global/security/PrincipalDetails.java b/src/main/java/org/example/siljeun/global/security/PrincipalDetails.java
index 40c0d2a..dc7e71c 100644
--- a/src/main/java/org/example/siljeun/global/security/PrincipalDetails.java
+++ b/src/main/java/org/example/siljeun/global/security/PrincipalDetails.java
@@ -2,12 +2,14 @@
 
 import java.util.Collection;
 import java.util.List;
+import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 import org.example.siljeun.domain.user.entity.User;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;
 
+@Getter
 @RequiredArgsConstructor
 public class PrincipalDetails implements UserDetails {
 
@@ -49,7 +51,8 @@ public boolean isCredentialsNonExpired() {
 
   @Override
   public boolean isEnabled() {
-    return user.getDeletedAt() != null;
+    // 삭제되지 않은 계정은 모두 활성화된 것으로 취급
+    return user.getDeletedAt() == null;
   }
 
-}
+}
\ No newline at end of file
diff --git a/src/main/java/org/example/siljeun/global/util/RedisKeyProvider.java b/src/main/java/org/example/siljeun/global/util/RedisKeyProvider.java
new file mode 100644
index 0000000..1d5f31f
--- /dev/null
+++ b/src/main/java/org/example/siljeun/global/util/RedisKeyProvider.java
@@ -0,0 +1,23 @@
+package org.example.siljeun.global.util;
+
+public class RedisKeyProvider {
+
+    //회차에 따른 회차별 좌석 정보 Id와 상태
+    public static String seatStatusKey(Long scheduleId){
+        return "seatStatus:" + scheduleId;
+    }
+
+    //유저가 선점한 특정 회차의 좌석 상태 정보 Id
+    public static String userSelectedSeatKey(Long userId, Long scheduleId){
+        return "user:"+userId+":schedule:"+scheduleId;
+    }
+
+    //회차별 좌석 상태 정보 점유중
+    public static String seatOccupyKey(Long seatScheduleInfoId){
+        return "seat:occupy:"+seatScheduleInfoId;
+    }
+
+    public static String trackExpiresKey(String status){
+        return "expires:"+status;
+    }
+}
diff --git a/src/main/resources/static/checkout.html b/src/main/resources/static/checkout.html
index c0d9c69..f3a1dd6 100644
--- a/src/main/resources/static/checkout.html
+++ b/src/main/resources/static/checkout.html
@@ -37,7 +37,7 @@
         // ------ 주문의 결제 금액 설정 ------
         await widgets.setAmount({
             currency: "KRW",
-            value: 50000,
+            value: 5000,
         });
 
         await Promise.all([