diff --git a/src/main/java/com/example/oneul/domain/user/api/UserApi.java b/src/main/java/com/example/oneul/domain/user/api/UserApi.java
index 017dca5..8fa29e0 100644
--- a/src/main/java/com/example/oneul/domain/user/api/UserApi.java
+++ b/src/main/java/com/example/oneul/domain/user/api/UserApi.java
@@ -1,6 +1,5 @@
 package com.example.oneul.domain.user.api;
 
-
 import javax.servlet.http.HttpSession;
 
 import com.example.oneul.domain.user.domain.UserEntity;
@@ -15,10 +14,6 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RestController;
 
-
-
-
-
 @RestController
 @RequestMapping(value = "/user")
 public class UserApi {
@@ -34,17 +29,20 @@ public class UserApi {
     public UserEntity signUp(@RequestBody SignUpDTO signUpDTO) {
         // TODO: password1, password2 같은지 검사
         UserEntity user = userService.signUp(signUpDTO.toEntity());
+        log.info("signUp: " + user.toString());
         return user;
     }
 
     @RequestMapping(value="/login/", method=RequestMethod.POST)
     public UserEntity login(HttpSession httpSession, @RequestBody LoginDTO loginDTO) {
         UserEntity user = userService.login(loginDTO.toEntity(), httpSession);
+        log.info("login: " + user.toString());
         return user;
     }
     
     @RequestMapping(value="/logout/", method=RequestMethod.POST)
     public String logout(HttpSession httpSession) {
+        log.info("logout: " + httpSession.toString());
         userService.logout(httpSession);
         return "logout";
     }
diff --git a/src/main/java/com/example/oneul/domain/user/dao/UserCommandRepository.java b/src/main/java/com/example/oneul/domain/user/dao/UserCommandRepository.java
deleted file mode 100644
index 64f7931..0000000
--- a/src/main/java/com/example/oneul/domain/user/dao/UserCommandRepository.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.example.oneul.domain.user.dao;
-
-import java.util.Optional;
-
-import com.example.oneul.domain.user.domain.UserEntity;
-
-import org.springframework.data.repository.CrudRepository;
-import org.springframework.stereotype.Repository;
-
-@Repository
-public interface UserCommandRepository extends CrudRepository<UserEntity, Long> {
-    Optional<UserEntity> findByUsername(String username);
-}
\ No newline at end of file
diff --git a/src/main/java/com/example/oneul/global/error/GlobalExceptionHandler.java b/src/main/java/com/example/oneul/global/error/GlobalExceptionHandler.java
index 284bbfa..8451a07 100644
--- a/src/main/java/com/example/oneul/global/error/GlobalExceptionHandler.java
+++ b/src/main/java/com/example/oneul/global/error/GlobalExceptionHandler.java
@@ -5,6 +5,8 @@ import com.example.oneul.domain.user.exception.WrongUsernameAndPasswordException
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 
@@ -13,20 +15,20 @@ public class GlobalExceptionHandler {
     private static final Logger log = LoggerFactory.getLogger(GlobalExceptionHandler.class);
 
     @ExceptionHandler(Exception.class)
-    protected String handleException(Exception e){
+    protected ResponseEntity<String> handleException(Exception e){
         log.info(e.getMessage());
-        return e.toString();
+        return new ResponseEntity<>("invalid request", HttpStatus.INTERNAL_SERVER_ERROR);
     }
 
     @ExceptionHandler(UserAlreadyExistException.class)
-    protected String handleUserAlreadyExistException(UserAlreadyExistException e){
+    protected ResponseEntity<String> handleUserAlreadyExistException(UserAlreadyExistException e){
         log.info(e.getMessage());
-        return e.toString();
+        return new ResponseEntity<>("user is already exists", HttpStatus.CONFLICT);
     }
 
     @ExceptionHandler(WrongUsernameAndPasswordException.class)
-    protected String handleWrongUsernameAndPasswordException(WrongUsernameAndPasswordException e){
-        log.info(e.getMessage());
-        return e.toString();
+    protected ResponseEntity<String> handleWrongUsernameAndPasswordException(WrongUsernameAndPasswordException e){
+        log.info("wrong username and password");
+        return new ResponseEntity<>("wrong username and password", HttpStatus.NOT_FOUND);
     }
 }