diff --git a/src/main/java/org/ezcode/codetest/application/usermanagement/user/service/UserService.java b/src/main/java/org/ezcode/codetest/application/usermanagement/user/service/UserService.java
index 2cda108d..32ff7efa 100644
--- a/src/main/java/org/ezcode/codetest/application/usermanagement/user/service/UserService.java
+++ b/src/main/java/org/ezcode/codetest/application/usermanagement/user/service/UserService.java
@@ -35,6 +35,7 @@
 import org.springframework.stereotype.Service;
 
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StringUtils;
 import org.springframework.web.multipart.MultipartFile;
 
 import lombok.RequiredArgsConstructor;
@@ -106,10 +107,10 @@ public UserInfoResponse modifyUserInfo(AuthUser authUser, ModifyUserInfoRequest
 			String oldImageUrl = user.getProfileImageUrl();
 
 			user.modifyProfileImage(profileImageUrl);
-			if (oldImageUrl!=null) {
-				s3Uploader.delete(user.getProfileImageUrl(), "profile");
-			}
 
+			if (StringUtils.hasText(oldImageUrl)) {
+				s3Uploader.delete(oldImageUrl, "profile");
+			}
 		}
 
 		return UserInfoResponse.builder()
diff --git a/src/main/java/org/ezcode/codetest/infrastructure/s3/S3Uploader.java b/src/main/java/org/ezcode/codetest/infrastructure/s3/S3Uploader.java
index 8198352c..c5f05088 100644
--- a/src/main/java/org/ezcode/codetest/infrastructure/s3/S3Uploader.java
+++ b/src/main/java/org/ezcode/codetest/infrastructure/s3/S3Uploader.java
@@ -1,6 +1,8 @@
 package org.ezcode.codetest.infrastructure.s3;
 
 import java.io.IOException;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
 import java.util.UUID;
 
 import org.ezcode.codetest.infrastructure.s3.exception.S3Exception;
@@ -78,7 +80,10 @@ public void delete(String fileUrl, String dirName) {
 			if (dirName.equalsIgnoreCase("profile")) {
 				fileName = extractKeyFromProfileUrl(fileUrl);
 			}
-			amazonS3.deleteObject(bucket, fileName); // S3 내 이미지 객체 제거.
+
+			String decodedFileName = URLDecoder.decode(fileName, StandardCharsets.UTF_8);
+			amazonS3.deleteObject(bucket, decodedFileName); // S3 내 이미지 객체 제거.
+
 			log.info("S3에서 이미지 삭제 완료: {}", fileName);
 		} catch (Exception e) {
 			log.error("S3 이미지 삭제 실패: {}", fileUrl, e);
diff --git a/src/main/java/org/ezcode/codetest/infrastructure/swagger/config/SwaggerConfig.java b/src/main/java/org/ezcode/codetest/infrastructure/swagger/config/SwaggerConfig.java
index 6dde2f07..f607d163 100644
--- a/src/main/java/org/ezcode/codetest/infrastructure/swagger/config/SwaggerConfig.java
+++ b/src/main/java/org/ezcode/codetest/infrastructure/swagger/config/SwaggerConfig.java
@@ -16,6 +16,10 @@
 		@Server(
 			url = "https://api.ezcode.my",           // ← 슬래시 없이 호스트만!
 			description = "Production server"
+		),
+		@Server(
+			url = "http://localhost:8080",
+			description = "Local Server"
 		)
 	},
 	info = @Info(title = "API 문서", version = "v1"),
diff --git a/src/main/java/org/ezcode/codetest/presentation/usermanagement/UserController.java b/src/main/java/org/ezcode/codetest/presentation/usermanagement/UserController.java
index 27f2c0f4..f4250bd6 100644
--- a/src/main/java/org/ezcode/codetest/presentation/usermanagement/UserController.java
+++ b/src/main/java/org/ezcode/codetest/presentation/usermanagement/UserController.java
@@ -1,10 +1,8 @@
 package org.ezcode.codetest.presentation.usermanagement;
 
-import org.ezcode.codetest.application.submission.dto.response.language.LanguageResponse;
 import org.ezcode.codetest.application.usermanagement.user.dto.request.ModifyUserInfoRequest;
 import org.ezcode.codetest.application.usermanagement.user.dto.request.ChangeUserPasswordRequest;
 import org.ezcode.codetest.application.usermanagement.user.dto.response.ChangeUserPasswordResponse;
-import org.ezcode.codetest.application.usermanagement.user.dto.response.GrantAdminRoleResponse;
 import org.ezcode.codetest.application.usermanagement.user.dto.response.UserDailySolvedHistoryResponse;
 import org.ezcode.codetest.application.usermanagement.user.dto.response.UserInfoResponse;
 import org.ezcode.codetest.application.usermanagement.user.dto.response.UserProfileImageResponse;
@@ -26,6 +24,9 @@
 import org.springframework.web.multipart.MultipartFile;
 
 import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Encoding;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
@@ -46,7 +47,17 @@ public ResponseEntity<UserInfoResponse> getUserInfo(@AuthenticationPrincipal Aut
 		return ResponseEntity.status(HttpStatus.OK).body(userService.getUserInfo(authUser));
 	}
 
-	@Operation(summary = "내 정보 수정", description = "닉네임, 블로그, 깃허브, 소개 등 개인 정보를 추가하거나 수정합니다.")
+	@Operation(
+		summary = "내 정보 수정",
+		description = "닉네임, 블로그, 깃허브, 소개 등 개인 정보를 추가하거나 수정합니다.",
+		// ▼ 이 부분이 핵심입니다. Swagger에게 'request' 파트의 Content-Type을 강제합니다.
+		requestBody = @io.swagger.v3.oas.annotations.parameters.RequestBody(
+			content = @Content(
+				mediaType = MediaType.MULTIPART_FORM_DATA_VALUE,
+				encoding = @Encoding(name = "request", contentType = MediaType.APPLICATION_JSON_VALUE)
+			)
+		)
+	)
     @PutMapping(value = "/users", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
 	public ResponseEntity<UserInfoResponse> modifyUserInfo(
 		@AuthenticationPrincipal AuthUser authUser,