diff --git a/src/main/java/com/mey/backend/domain/auth/dto/LoginRequest.java b/src/main/java/com/mey/backend/domain/auth/dto/LoginRequest.java
index 0b9778a..b024604 100644
--- a/src/main/java/com/mey/backend/domain/auth/dto/LoginRequest.java
+++ b/src/main/java/com/mey/backend/domain/auth/dto/LoginRequest.java
@@ -3,9 +3,11 @@
 import jakarta.validation.constraints.NotBlank;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import lombok.ToString;
 
 @Getter
 @NoArgsConstructor
+@ToString(exclude = {"password", "email"})
 public class LoginRequest {
 
     @NotBlank(message = "이메일은 필수입니다")
diff --git a/src/main/java/com/mey/backend/domain/auth/dto/SignupRequest.java b/src/main/java/com/mey/backend/domain/auth/dto/SignupRequest.java
index f8b1d77..3225b36 100644
--- a/src/main/java/com/mey/backend/domain/auth/dto/SignupRequest.java
+++ b/src/main/java/com/mey/backend/domain/auth/dto/SignupRequest.java
@@ -5,9 +5,11 @@
 import jakarta.validation.constraints.Size;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import lombok.ToString;
 
 @Getter
 @NoArgsConstructor
+@ToString(exclude = {"password", "email"})
 public class SignupRequest {
 
     @NotBlank(message = "닉네임은 필수입니다")
diff --git a/src/main/java/com/mey/backend/domain/chatbot/controller/ChatController.java b/src/main/java/com/mey/backend/domain/chatbot/controller/ChatController.java
index 90e4259..b9e8503 100644
--- a/src/main/java/com/mey/backend/domain/chatbot/controller/ChatController.java
+++ b/src/main/java/com/mey/backend/domain/chatbot/controller/ChatController.java
@@ -32,7 +32,7 @@ public class ChatController {
     )
     @PostMapping("/query")
     public CommonResponse<ChatResponse> sendMessage(@RequestBody ChatRequest request) {
-        log.info("chat request: {}", request.getQuery());
+        log.info("챗봇 요청 처리 시작");
 
         try {
             ChatResponse response = chatService.processUserQuery(request);
diff --git a/src/main/java/com/mey/backend/domain/chatbot/dto/ChatRequest.java b/src/main/java/com/mey/backend/domain/chatbot/dto/ChatRequest.java
index c4f3c41..506cf80 100644
--- a/src/main/java/com/mey/backend/domain/chatbot/dto/ChatRequest.java
+++ b/src/main/java/com/mey/backend/domain/chatbot/dto/ChatRequest.java
@@ -6,12 +6,14 @@
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import lombok.ToString;
 
 @Schema(description = "채팅 요청 DTO")
 @Getter
 @Builder(toBuilder = true)
 @NoArgsConstructor
 @AllArgsConstructor
+@ToString(exclude = {"query"})
 public class ChatRequest {
     @Schema(description = "사용자 질문", example = "k-pop 루트 추천해줘")
     @NotBlank
diff --git a/src/main/java/com/mey/backend/domain/chatbot/repository/InMemoryDocumentVectorStore.java b/src/main/java/com/mey/backend/domain/chatbot/repository/InMemoryDocumentVectorStore.java
index 7971ec6..bb6530e 100644
--- a/src/main/java/com/mey/backend/domain/chatbot/repository/InMemoryDocumentVectorStore.java
+++ b/src/main/java/com/mey/backend/domain/chatbot/repository/InMemoryDocumentVectorStore.java
@@ -117,7 +117,7 @@ public void addDocumentFile(String id, File file, Map<String, Object> metadata)
      * @return 유사도 순으로 정렬된 검색 결과 목록
      */
     public List<DocumentSearchResult> similaritySearch(String query, int maxResults) {
-        log.debug("유사도 검색 시작 - 질의: '{}', 최대 결과: {}", query, maxResults);
+        log.debug("유사도 검색 시작 - 최대 결과: {}", maxResults);
 
         try {
             // 검색 요청 구성
@@ -139,7 +139,7 @@ public List<DocumentSearchResult> similaritySearch(String query, int maxResults)
                     .map(this::mapToSearchResult)
                     .collect(Collectors.toList());
         } catch (Exception e) {
-            log.error("유사도 검색 실패 - 질의: '{}'", query, e);
+            log.error("유사도 검색 실패", e);
             throw new SimilarityProcessingException();
         }
     }
diff --git a/src/main/java/com/mey/backend/domain/chatbot/service/ChatService.java b/src/main/java/com/mey/backend/domain/chatbot/service/ChatService.java
index 73c8776..5027eed 100644
--- a/src/main/java/com/mey/backend/domain/chatbot/service/ChatService.java
+++ b/src/main/java/com/mey/backend/domain/chatbot/service/ChatService.java
@@ -88,7 +88,7 @@ public void initializeVectorStore() {
      * 상태 기반 대화 처리를 지원하며, 세션 연속성을 보장합니다.
      */
     public ChatResponse processUserQuery(ChatRequest request) {
-        log.info("Processing user query: {} (language: {})", request.getQuery(), request.getLanguage());
+        log.info("사용자 쿼리 처리 시작 (언어: {})", request.getLanguage());
 
         // 1. 언어 검증 및 설정
         String validatedLanguage = languageService.validateAndGetLanguage(request.getLanguage());
diff --git a/src/main/java/com/mey/backend/domain/chatbot/service/ContextExtractor.java b/src/main/java/com/mey/backend/domain/chatbot/service/ContextExtractor.java
index 34bcd23..0c2b203 100644
--- a/src/main/java/com/mey/backend/domain/chatbot/service/ContextExtractor.java
+++ b/src/main/java/com/mey/backend/domain/chatbot/service/ContextExtractor.java
@@ -228,7 +228,7 @@ private ChatContext mergeContexts(ChatContext existingContext, ChatContext extra
      * AI 파싱 실패 시 fallback 로직
      */
     private ChatContext extractContextFallback(String query, ChatContext existingContext) {
-        log.info("Using fallback context extraction for query: {}", query);
+        log.info("fallback context extraction 사용");
         
         ChatContext.ChatContextBuilder builder = existingContext != null ? 
                 existingContext.toBuilder() : ChatContext.builder();
diff --git a/src/main/java/com/mey/backend/domain/place/service/PlaceTourApiClient.java b/src/main/java/com/mey/backend/domain/place/service/PlaceTourApiClient.java
index e1dee30..46ab3ee 100644
--- a/src/main/java/com/mey/backend/domain/place/service/PlaceTourApiClient.java
+++ b/src/main/java/com/mey/backend/domain/place/service/PlaceTourApiClient.java
@@ -98,7 +98,7 @@ public List<RelatedResponseDto> fetchRelatedPlaces(double latitude, double longi
             JsonNode items = om.readTree(body).at("/response/body/items/item");
 
             if (items.isArray()) {
-                log.info("📍 locationBasedList2 {}건 lat={}, lon={}", items.size(), latitude, longitude);
+                log.info("📍 locationBasedList2 {}건 조회됨", items.size());
 
                 for (JsonNode it : items) {
                     String address = it.path("addr1").asText("");
@@ -115,12 +115,12 @@ public List<RelatedResponseDto> fetchRelatedPlaces(double latitude, double longi
                     ));
                 }
             } else {
-                log.warn("⚠️ locationBasedList2 결과 없음 lat={}, lon={}", latitude, longitude);
+                log.warn("⚠️ locationBasedList2 결과 없음");
             }
 
             return out;
         } catch (Exception e) {
-            log.error("❌ locationBasedList2 호출 실패 lat={}, lon={}", latitude, longitude, e);
+            log.error("❌ locationBasedList2 호출 실패", e);
         }
         return List.of();
     }
diff --git a/src/main/java/com/mey/backend/domain/user/dto/UserInfoResponse.java b/src/main/java/com/mey/backend/domain/user/dto/UserInfoResponse.java
index e4a0a24..e6affb0 100644
--- a/src/main/java/com/mey/backend/domain/user/dto/UserInfoResponse.java
+++ b/src/main/java/com/mey/backend/domain/user/dto/UserInfoResponse.java
@@ -4,9 +4,11 @@
 import com.mey.backend.domain.user.entity.User;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
+import lombok.ToString;
 
 @Getter
 @AllArgsConstructor
+@ToString(exclude = {"email"})
 public class UserInfoResponse {
     private Long id;
     private String nickname;
diff --git a/src/main/java/com/mey/backend/domain/user/dto/UserInfoUpdateRequest.java b/src/main/java/com/mey/backend/domain/user/dto/UserInfoUpdateRequest.java
index 34ecd75..617da97 100644
--- a/src/main/java/com/mey/backend/domain/user/dto/UserInfoUpdateRequest.java
+++ b/src/main/java/com/mey/backend/domain/user/dto/UserInfoUpdateRequest.java
@@ -3,9 +3,11 @@
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import lombok.ToString;
 
 @Getter
 @NoArgsConstructor
+@ToString(exclude = {"password", "email"})
 @Schema(description = "사용자 정보 수정 요청")
 public class UserInfoUpdateRequest {
     
diff --git a/src/main/java/com/mey/backend/domain/user/entity/User.java b/src/main/java/com/mey/backend/domain/user/entity/User.java
index ec54aef..b351a1d 100644
--- a/src/main/java/com/mey/backend/domain/user/entity/User.java
+++ b/src/main/java/com/mey/backend/domain/user/entity/User.java
@@ -14,6 +14,7 @@
 @Getter
 @Setter
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
+@ToString(exclude = {"password", "email"})
 public class User implements UserDetails {
 
     @Id
diff --git a/src/main/java/com/mey/backend/domain/user/service/UserDetailsServiceImpl.java b/src/main/java/com/mey/backend/domain/user/service/UserDetailsServiceImpl.java
index db3acc0..16ce40a 100644
--- a/src/main/java/com/mey/backend/domain/user/service/UserDetailsServiceImpl.java
+++ b/src/main/java/com/mey/backend/domain/user/service/UserDetailsServiceImpl.java
@@ -16,6 +16,6 @@ public class UserDetailsServiceImpl implements UserDetailsService {
     @Override
     public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
         return userRepository.findByEmail(email)
-                .orElseThrow(() -> new UsernameNotFoundException("User not found: " + email));
+                .orElseThrow(() -> new UsernameNotFoundException("User not found"));
     }
 }
\ No newline at end of file
diff --git a/src/main/java/com/mey/backend/global/exception/GlobalExceptionHandler.java b/src/main/java/com/mey/backend/global/exception/GlobalExceptionHandler.java
index 70880f9..066528b 100644
--- a/src/main/java/com/mey/backend/global/exception/GlobalExceptionHandler.java
+++ b/src/main/java/com/mey/backend/global/exception/GlobalExceptionHandler.java
@@ -86,7 +86,7 @@ public ResponseEntity<Object> handleGeneral(GeneralException generalException, H
     public ResponseEntity<Object> handleOthers(Exception e, WebRequest request) {
         CommonResponse<Object> body = CommonResponse.onFailure(ErrorStatus.INTERNAL_SERVER_ERROR.getCode(),
                 ErrorStatus.INTERNAL_SERVER_ERROR.getMessage(),
-                e.getMessage());
+                null);
 
         return super.handleExceptionInternal(e, body, HttpHeaders.EMPTY,
                 ErrorStatus.INTERNAL_SERVER_ERROR.getHttpStatus(), request);
diff --git a/src/main/resources/application-dev.yml b/src/main/resources/application-dev.yml
index f599207..99dd836 100644
--- a/src/main/resources/application-dev.yml
+++ b/src/main/resources/application-dev.yml
@@ -24,7 +24,10 @@ spring:
 
 logging:
   level:
-    com.mey.backend: DEBUG
-    org.springframework.web: DEBUG
+    com.mey.backend: INFO
+    org.springframework.web: WARN
+    org.springframework.security: WARN
     org.hibernate.tool.schema.internal: warn
     org.hibernate.sql: warn
+    org.springframework.web.servlet.DispatcherServlet: ERROR
+    org.springframework.security.web.FilterChainProxy: ERROR
diff --git a/src/main/resources/application-prod.yml b/src/main/resources/application-prod.yml
index 8337ae1..1c9ffa4 100644
--- a/src/main/resources/application-prod.yml
+++ b/src/main/resources/application-prod.yml
@@ -19,5 +19,11 @@ spring:
 
 logging:
   level:
-    com.mey.backend: INFO
-    org.springframework.web: WARN
+    com.mey.backend: WARN
+    org.springframework.web: ERROR
+    org.springframework.security: ERROR
+    org.hibernate.sql: ERROR
+    org.springframework.web.servlet.DispatcherServlet: ERROR
+    org.springframework.security.web.FilterChainProxy: ERROR
+    org.springframework.boot.autoconfigure: ERROR
+    root: WARN