diff --git a/src/main/kotlin/com/toyProject7/karrot/socialLogin/handler/CustomAuthenticationSuccessHandler.kt b/src/main/kotlin/com/toyProject7/karrot/socialLogin/handler/CustomAuthenticationSuccessHandler.kt
index 5d84393..319c3f5 100644
--- a/src/main/kotlin/com/toyProject7/karrot/socialLogin/handler/CustomAuthenticationSuccessHandler.kt
+++ b/src/main/kotlin/com/toyProject7/karrot/socialLogin/handler/CustomAuthenticationSuccessHandler.kt
@@ -31,10 +31,9 @@ class CustomAuthenticationSuccessHandler(
         val attributes = oauth2User.attributes
         val providerId = extractProviderId(attributes, provider)
         val email = extractEmail(attributes, provider)
-        val name = extractName(attributes, provider)
 
         // Create or retrieve the user
-        val user = userService.createOrRetrieveSocialUser(email, providerId, provider, name)
+        val user = userService.createOrRetrieveSocialUser(email, providerId, provider)
 
         // Generate JWT
         val accessToken = UserAccessTokenUtil.generateAccessToken(user.id)
@@ -86,7 +85,7 @@ class CustomAuthenticationSuccessHandler(
         }
     }
 
-    private fun extractName(
+    /*private fun extractName(
         attributes: Map<String, Any>,
         provider: String,
     ): String {
@@ -100,5 +99,5 @@ class CustomAuthenticationSuccessHandler(
             }
             else -> "Unknown"
         }
-    }
+    }*/
 }
diff --git a/src/main/kotlin/com/toyProject7/karrot/user/service/UserService.kt b/src/main/kotlin/com/toyProject7/karrot/user/service/UserService.kt
index bf5a8e5..5d1ef37 100644
--- a/src/main/kotlin/com/toyProject7/karrot/user/service/UserService.kt
+++ b/src/main/kotlin/com/toyProject7/karrot/user/service/UserService.kt
@@ -108,20 +108,30 @@ class UserService(
         email: String,
         providerId: String,
         provider: String,
-        username: String,
     ): User {
         // Check if the user exists by email
         val existingUser = userRepository.findSocialUserByEmail(email)
 
         return existingUser?.let {
-            // Convert existingUser (of type SocialUser) to User DTO
+            // If the user exists, convert to User DTO and return
             User.fromEntity(it)
         } ?: run {
-            // If the user doesn't exist, create a new one
+            // If the user doesn't exist, generate a unique random username
+            var username = generateRandomString()
+            var isUnique = false
+
+            while (!isUnique) {
+                if (!userRepository.existsByNickname(username)) {
+                    isUnique = true
+                }
+                username = generateRandomString()
+            }
+
+            // Create a new SocialUser with the generated username
             val newUser =
                 SocialUser(
                     email = email,
-                    nickname = username,
+                    nickname = username, // Assign the generated username
                     provider = provider,
                     providerId = providerId,
                     location = "void",
@@ -129,18 +139,29 @@ class UserService(
                     imageUrl = null,
                     updatedAt = Instant.now(),
                 )
-            val savedUser = userRepository.save(newUser) // This should save as SocialUser
 
+            // Save the new user
+            val savedUser = userRepository.save(newUser)
+
+            // Create and save the associated profile
             val profileEntity =
                 ProfileEntity(
                     user = newUser,
                 )
             profileService.saveProfileEntity(profileEntity)
 
-            User.fromEntity(savedUser) // Convert and return as User DTO
+            // Convert and return as User DTO
+            User.fromEntity(savedUser)
         }
     }
 
+    private fun generateRandomString(length: Int = 8): String {
+        val characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+        return (1..length)
+            .map { characters.random() }
+            .joinToString("")
+    }
+
     @Transactional
     fun getUserEntityById(id: String): UserEntity {
         return userRepository.findByIdOrNull(id) ?: throw UserNotFoundException()