diff --git a/src/main/java/leets/weeth/domain/user/dto/UserDTO.java b/src/main/java/leets/weeth/domain/user/dto/UserDTO.java
index 3cd32fdf..51f3d60a 100644
--- a/src/main/java/leets/weeth/domain/user/dto/UserDTO.java
+++ b/src/main/java/leets/weeth/domain/user/dto/UserDTO.java
@@ -41,7 +41,8 @@ public record Response(
             String tel,
             String department,
             List<Integer> cardinals,
-            Position position
+            Position position,
+            Role role
     ) {}
 
     public record AdminResponse (
diff --git a/src/main/java/leets/weeth/domain/user/service/UserService.java b/src/main/java/leets/weeth/domain/user/service/UserService.java
index d14158c9..c8df4327 100644
--- a/src/main/java/leets/weeth/domain/user/service/UserService.java
+++ b/src/main/java/leets/weeth/domain/user/service/UserService.java
@@ -50,7 +50,8 @@ public void applyOB(Long userId, Integer cardinal) {
         User user = userRepository.findById(userId)
                 .orElseThrow(UserNotFoundException::new);
 
-        user.applyOB(cardinal);
+        if(!user.getCardinals().contains(cardinal))
+            user.applyOB(cardinal);
     }
 
     public Map<Integer, List<UserDTO.Response>> findAll() {