diff --git a/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/controller/AuthCheckController.java b/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/controller/AuthCheckController.java
index a6a6f9145..7f7e18cd6 100644
--- a/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/controller/AuthCheckController.java
+++ b/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/controller/AuthCheckController.java
@@ -33,6 +33,6 @@ public ResponseEntity<?> checkUsername(@RequestParam @Validated String username)
     public ResponseEntity<?> findUsername(@RequestParam @Validated String phone) {
         return ResponseEntity.ok(
                 SuccessResponse.from("username",
-                        authCheckUseCase.findUsername("010-2629-4624")));
+                        authCheckUseCase.findUsername(phone)));
     }
 }
diff --git a/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/usecase/AuthCheckUseCase.java b/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/usecase/AuthCheckUseCase.java
index fd93b6d30..5d6052c7a 100644
--- a/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/usecase/AuthCheckUseCase.java
+++ b/pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/auth/usecase/AuthCheckUseCase.java
@@ -19,7 +19,6 @@ public boolean checkUsernameDuplicate(String username) {
 
     @Transactional(readOnly = true)
     public String findUsername(String phone) {
-        System.out.println("phone: " + userService.readUserByPhone("010-2629-4624"));
         return userService.readUserByPhone(phone)
                 .map(user -> user.getUsername())
                 .orElse(null);