diff --git a/src/main/java/kr/re/etri/security/jwt/controllers/AuthController.java b/src/main/java/kr/re/etri/security/jwt/controllers/AuthController.java
index a549d58..01e5e4a 100644
--- a/src/main/java/kr/re/etri/security/jwt/controllers/AuthController.java
+++ b/src/main/java/kr/re/etri/security/jwt/controllers/AuthController.java
@@ -15,6 +15,7 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.core.Authentication;
+import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.web.bind.annotation.*;
@@ -63,12 +64,11 @@ public class AuthController {
   @Autowired
   RefreshTokenService refreshTokenService;
 
-  @Operation(summary = "User login", description = "Authenticate user and return JWT and refresh token cookies.")
+  @Operation(summary = "로그인", description = "사용자 인증 후 JWT 및 리프레시 토큰 쿠키를 반환합니다.")
   @ApiResponses({
-          @ApiResponse(responseCode = "200", description = "Login successful"),
-          @ApiResponse(responseCode = "401", description = "Invalid credentials")
+          @ApiResponse(responseCode = "200", description = "로그인 성공"),
+          @ApiResponse(responseCode = "401", description = "잘못된 사용자명 또는 비밀번호")
   })
-
   @PostMapping("/signin")
   public ResponseEntity<?> authenticateUser(@Valid @RequestBody LoginRequest loginRequest) {
     Authentication authentication = authenticationManager.authenticate(
@@ -87,7 +87,7 @@ public class AuthController {
     ResponseCookie jwtRefreshCookie = jwtUtils.generateRefreshJwtCookie(refreshToken.getToken());
 
     List<String> roles = userDetails.getAuthorities().stream()
-            .map(item -> item.getAuthority())
+            .map(GrantedAuthority::getAuthority)
             .collect(Collectors.toList());
 
     return ResponseEntity.ok()
@@ -101,6 +101,11 @@ public class AuthController {
             ));
   }
 
+  @Operation(summary = "회원가입", description = "새로운 사용자를 등록합니다.")
+  @ApiResponses({
+          @ApiResponse(responseCode = "200", description = "회원가입 성공"),
+          @ApiResponse(responseCode = "400", description = "중복된 사용자명 또는 이메일")
+  })
   @PostMapping("/signup")
   public ResponseEntity<?> registerUser(@Valid @RequestBody SignupRequest signUpRequest) {
     if (userRepository.existsByUsername(signUpRequest.getUsername())) {
@@ -144,8 +149,10 @@ public class AuthController {
     return ResponseEntity.ok(new MessageResponse("User registered successfully!"));
   }
 
-  @Operation(summary = "Logout", description = "Logout current user by deleting cookies and refresh token.")
-  @ApiResponse(responseCode = "200", description = "Logged out successfully")
+  @Operation(summary = "로그아웃", description = "현재 사용자를 로그아웃하고 쿠키 및 리프레시 토큰을 삭제합니다.")
+  @ApiResponses({
+          @ApiResponse(responseCode = "200", description = "로그아웃 성공")
+  })
   @PostMapping("/signout")
   public ResponseEntity<?> logoutUser() {
     Object principle = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
@@ -163,10 +170,10 @@ public class AuthController {
             .body(new MessageResponse("You've been signed out!"));
   }
 
-  @Operation(summary = "Refresh token", description = "Get a new access token using the refresh token from cookie.")
+  @Operation(summary = "토큰 갱신", description = "쿠키에 저장된 리프레시 토큰을 통해 새로운 엑세스 토큰을 발급합니다.")
   @ApiResponses({
-          @ApiResponse(responseCode = "200", description = "Token refreshed successfully"),
-          @ApiResponse(responseCode = "400", description = "Refresh token is missing or invalid")
+          @ApiResponse(responseCode = "200", description = "토큰 갱신 성공"),
+          @ApiResponse(responseCode = "400", description = "리프레시 토큰이 없거나 유효하지 않음")
   })
   @PostMapping("/refreshtoken")
   public ResponseEntity<?> refreshtoken(HttpServletRequest request) {
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 0b07387..807a35a 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -5,6 +5,11 @@ spring.datasource.password=cuuva
 spring.jpa.database-platform=org.hibernate.dialect.MariaDBDialect
 spring.jpa.hibernate.ddl-auto= create-drop
 
+spring.sql.init.mode=always
+
+spring.jpa.defer-datasource-initialization=true
+
+
 # App Properties
 bezkoder.app.jwtCookieName= bezkoder-jwt
 bezkoder.app.jwtRefreshCookieName= bezkoder-jwt-refresh
diff --git a/src/main/resources/data.sql b/src/main/resources/data.sql
new file mode 100644
index 0000000..14e282c
--- /dev/null
+++ b/src/main/resources/data.sql
@@ -0,0 +1,5 @@
+-- src/main/resources/data.sql
+
+INSERT INTO tb_role (id, name) VALUES (1, 'ROLE_USER');
+INSERT INTO tb_role (id, name) VALUES (2, 'ROLE_MODERATOR');
+INSERT INTO tb_role (id, name) VALUES (3, 'ROLE_ADMIN');