diff --git a/KkuMulKum.xcodeproj/project.pbxproj b/KkuMulKum.xcodeproj/project.pbxproj
index 9b9e0fc5..cde3451a 100644
--- a/KkuMulKum.xcodeproj/project.pbxproj
+++ b/KkuMulKum.xcodeproj/project.pbxproj
@@ -24,6 +24,7 @@
 		782B407D2C3E3984008B0CA7 /* WelcomeViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 782B407C2C3E3984008B0CA7 /* WelcomeViewController.swift */; };
 		782B407F2C3E44B7008B0CA7 /* WelcomeViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 782B407E2C3E44B7008B0CA7 /* WelcomeViewModel.swift */; };
 		782B40822C3E4925008B0CA7 /* NicknameViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 782B40812C3E4925008B0CA7 /* NicknameViewModel.swift */; };
+		784824F72C6E1C9900FE07A0 /* AuthServiceProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = 784824F62C6E1C9900FE07A0 /* AuthServiceProtocol.swift */; };
 		784E4D942C3B1C7F00BC943C /* KakaoSDK in Frameworks */ = {isa = PBXBuildFile; productRef = 784E4D932C3B1C7F00BC943C /* KakaoSDK */; };
 		784E4D962C3B1C7F00BC943C /* KakaoSDKAuth in Frameworks */ = {isa = PBXBuildFile; productRef = 784E4D952C3B1C7F00BC943C /* KakaoSDKAuth */; };
 		784E4D992C3B95A900BC943C /* KeychainAccess in Frameworks */ = {isa = PBXBuildFile; productRef = 784E4D982C3B95A900BC943C /* KeychainAccess */; };
@@ -246,6 +247,7 @@
 		782B407C2C3E3984008B0CA7 /* WelcomeViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WelcomeViewController.swift; sourceTree = "<group>"; };
 		782B407E2C3E44B7008B0CA7 /* WelcomeViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WelcomeViewModel.swift; sourceTree = "<group>"; };
 		782B40812C3E4925008B0CA7 /* NicknameViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NicknameViewModel.swift; sourceTree = "<group>"; };
+		784824F62C6E1C9900FE07A0 /* AuthServiceProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthServiceProtocol.swift; sourceTree = "<group>"; };
 		785AE1D02C3B07A600677CA0 /* PrivacyInfo.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = PrivacyInfo.plist; sourceTree = "<group>"; };
 		789196332C486F6B00FF8CDF /* KeychainAccessible.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeychainAccessible.swift; sourceTree = "<group>"; };
 		789196352C492F8600FF8CDF /* AuthTargetType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthTargetType.swift; sourceTree = "<group>"; };
@@ -530,6 +532,14 @@
 			path = ViewModel;
 			sourceTree = "<group>";
 		};
+		784824F52C6E1C6800FE07A0 /* ServiceProtocol */ = {
+			isa = PBXGroup;
+			children = (
+				784824F62C6E1C9900FE07A0 /* AuthServiceProtocol.swift */,
+			);
+			path = ServiceProtocol;
+			sourceTree = "<group>";
+		};
 		789196392C49697F00FF8CDF /* Auth */ = {
 			isa = PBXGroup;
 			children = (
@@ -1064,6 +1074,7 @@
 		DD865B652C3920F600C351A2 /* Onboarding */ = {
 			isa = PBXGroup;
 			children = (
+				784824F52C6E1C6800FE07A0 /* ServiceProtocol */,
 				782B40762C3E389F008B0CA7 /* Welcome */,
 				DDFA50782C4693BD000A62E2 /* Profile */,
 				78AED1322C3D9514000AD80A /* Nickname */,
@@ -1866,6 +1877,7 @@
 				789196342C486F6B00FF8CDF /* KeychainAccessible.swift in Sources */,
 				DE254AB02C31195B00A4015E /* NSAttributedString+.swift in Sources */,
 				DD43937B2C412F4500EC1799 /* CreateMeetingViewController.swift in Sources */,
+				784824F72C6E1C9900FE07A0 /* AuthServiceProtocol.swift in Sources */,
 				DD86266C2C4606A300E4F980 /* SetReadyInfoViewController.swift in Sources */,
 				DE8247FD2C36E7C7000601BC /* MoyaLoggingPlugin.swift in Sources */,
 				DECB845C2C4442490022A003 /* FindPlaceViewController.swift in Sources */,
diff --git a/KkuMulKum/Network/Service/AuthService.swift b/KkuMulKum/Network/Service/AuthService.swift
index e96eaff0..a22d2218 100644
--- a/KkuMulKum/Network/Service/AuthService.swift
+++ b/KkuMulKum/Network/Service/AuthService.swift
@@ -5,15 +5,22 @@
 //  Created by 이지훈 on 7/14/24.
 //
 import Foundation
+
 import Moya
 
-protocol AuthServiceType {
-    func saveAccessToken(_ token: String) -> Bool
-    func saveRefreshToken(_ token: String) -> Bool
-    func getAccessToken() -> String?
-    func getRefreshToken() -> String?
-    func clearTokens() -> Bool
-    func performRequest<T: ResponseModelType>(_ target: AuthTargetType) async throws -> T
+enum NetworkErrorMapper {
+    static func mapErrorResponse(_ error: ErrorResponse) -> NetworkError {
+        switch error.code {
+        case 40080:
+            return .invalidImageFormat
+        case 40081:
+            return .imageSizeExceeded
+        case 40420:
+            return .userNotFound
+        default:
+            return .apiError(code: error.code, message: error.message)
+        }
+    }
 }
 
 class AuthService: AuthServiceType {
@@ -26,30 +33,6 @@ class AuthService: AuthServiceType {
         self.provider = provider
     }
     
-    func saveAccessToken(_ token: String) -> Bool {
-        keychainService.accessToken = token
-        return keychainService.accessToken == token
-    }
-    
-    func saveRefreshToken(_ token: String) -> Bool {
-        keychainService.refreshToken = token
-        return keychainService.refreshToken == token
-    }
-    
-    func getAccessToken() -> String? {
-        return keychainService.accessToken
-    }
-    
-    func getRefreshToken() -> String? {
-        return keychainService.refreshToken
-    }
-    
-    func clearTokens() -> Bool {
-        keychainService.accessToken = nil
-        keychainService.refreshToken = nil
-        return keychainService.accessToken == nil && keychainService.refreshToken == nil
-    }
-    
     func performRequest<T: ResponseModelType>(_ target: AuthTargetType) async throws -> T {
         return try await withCheckedThrowingContinuation { continuation in
             provider.request(target) { result in
@@ -61,7 +44,8 @@ class AuthService: AuthServiceType {
                     do {
                         let decodedResponse = try JSONDecoder().decode(ResponseBodyDTO<T>.self, from: response.data)
                         guard decodedResponse.success else {
-                            throw decodedResponse.error.map(self.mapErrorResponse) ?? NetworkError.unknownError("Unknown error occurred")
+                            throw decodedResponse.error.map(NetworkErrorMapper.mapErrorResponse) ?? 
+                            NetworkError.unknownError("Unknown error occurred")
                         }
                         guard let data = decodedResponse.data else {
                             if T.self == EmptyModel.self {
@@ -78,21 +62,35 @@ class AuthService: AuthServiceType {
                 case .failure(let error):
                     continuation.resume(throwing: NetworkError.networkError(error))
                 }
-       
+                
             }
         }
     }
+}
+
+
+extension AuthService {
+    func saveAccessToken(_ token: String) -> Bool {
+        keychainService.accessToken = token
+        return keychainService.accessToken == token
+    }
     
-    private func mapErrorResponse(_ error: ErrorResponse) -> NetworkError {
-        switch error.code {
-        case 40080:
-            return .invalidImageFormat
-        case 40081:
-            return .imageSizeExceeded
-        case 40420:
-            return .userNotFound
-        default:
-            return .apiError(code: error.code, message: error.message)
-        }
+    func saveRefreshToken(_ token: String) -> Bool {
+        keychainService.refreshToken = token
+        return keychainService.refreshToken == token
+    }
+    
+    func getAccessToken() -> String? {
+        return keychainService.accessToken
+    }
+    
+    func getRefreshToken() -> String? {
+        return keychainService.refreshToken
+    }
+    
+    func clearTokens() -> Bool {
+        keychainService.accessToken = nil
+        keychainService.refreshToken = nil
+        return keychainService.accessToken == nil && keychainService.refreshToken == nil
     }
 }
diff --git a/KkuMulKum/Source/Onboarding/ServiceProtocol/AuthServiceProtocol.swift b/KkuMulKum/Source/Onboarding/ServiceProtocol/AuthServiceProtocol.swift
new file mode 100644
index 00000000..5bb64773
--- /dev/null
+++ b/KkuMulKum/Source/Onboarding/ServiceProtocol/AuthServiceProtocol.swift
@@ -0,0 +1,18 @@
+//
+//  AuthServiceType.swift
+//  KkuMulKum
+//
+//  Created by 이지훈 on 8/15/24.
+//
+
+import Foundation
+
+protocol AuthServiceType {
+    func saveAccessToken(_ token: String) -> Bool
+    func saveRefreshToken(_ token: String) -> Bool
+    func getAccessToken() -> String?
+    func getRefreshToken() -> String?
+    func clearTokens() -> Bool
+    func performRequest<T: ResponseModelType>(_ target: AuthTargetType) async throws -> T
+}
+