diff --git a/KkuMulKum/Application/SceneDelegate.swift b/KkuMulKum/Application/SceneDelegate.swift
index 2af0dffc..bd9b87d7 100644
--- a/KkuMulKum/Application/SceneDelegate.swift
+++ b/KkuMulKum/Application/SceneDelegate.swift
@@ -36,7 +36,7 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
                 DispatchQueue.main.async {
                     if success {
                         print("Auto login successful, showing main screen")
-                        self?.showLoginScreen()
+                        self?.showMainScreen()
                     } else {
                         print("Auto login failed, showing login screen")
                         self?.showLoginScreen()
diff --git a/KkuMulKum/Source/Promise/ReadyStatus/View/ReadyStatusView.swift b/KkuMulKum/Source/Promise/ReadyStatus/View/ReadyStatusView.swift
index fa68f07c..424e143e 100644
--- a/KkuMulKum/Source/Promise/ReadyStatus/View/ReadyStatusView.swift
+++ b/KkuMulKum/Source/Promise/ReadyStatus/View/ReadyStatusView.swift
@@ -60,6 +60,7 @@ class ReadyStatusView: BaseView {
         collectionViewLayout: UICollectionViewFlowLayout().then {
             $0.scrollDirection = .vertical
             $0.estimatedItemSize = .init(width: Screen.width(335), height: Screen.height(72))
+            $0.minimumInteritemSpacing = 10
         }).then {
             $0.backgroundColor = .clear
             $0.isScrollEnabled = false
diff --git a/KkuMulKum/Source/Promise/Tardy/Service/TardyService.swift b/KkuMulKum/Source/Promise/Tardy/Service/TardyService.swift
index 4021acdb..302bc85b 100644
--- a/KkuMulKum/Source/Promise/Tardy/Service/TardyService.swift
+++ b/KkuMulKum/Source/Promise/Tardy/Service/TardyService.swift
@@ -8,10 +8,57 @@
 import Foundation
 
 protocol TardyServiceType {
-    func getPromiseTardyInfo(with promiseID: Int) -> ResponseBodyDTO<TardyInfoModel>?
+    func fetchTardyInfo(with promiseID: Int) async throws -> ResponseBodyDTO<TardyInfoModel>?
+    func updatePromiseCompletion(with promiseID: Int) async throws -> ResponseBodyDTO<EmptyModel>?
+}
+
+extension PromiseService: TardyServiceType {
+    func fetchTardyInfo(with promiseID: Int) async throws -> ResponseBodyDTO<TardyInfoModel>? {
+        return try await request(
+            with: .fetchTardyInfo(
+                promiseID: promiseID
+            )
+        )
+    }
+    
+    func updatePromiseCompletion(with promiseID: Int) async throws -> ResponseBodyDTO<EmptyModel>? {
+        return try await request(
+            with: .updatePromiseCompletion(
+                promiseID: promiseID
+            )
+        )
+    }
 }
 
 final class MockTardyService: TardyServiceType {
+    func fetchTardyInfo(with promiseID: Int) -> ResponseBodyDTO<TardyInfoModel>? {
+        let mockData = TardyInfoModel(
+            penalty: "티라미수 케익 릴스",
+            isPastDue: true,
+            lateComers: [Comer(
+                participantId: 1,
+                name: "유짐이",
+                profileImageURL: ""
+            )]
+        )
+        
+        return ResponseBodyDTO<TardyInfoModel>.init(
+            success: true,
+            data: mockData,
+            error: nil
+        )
+    }
+    
+    func updatePromiseCompletion(with promiseID: Int) -> ResponseBodyDTO<EmptyModel>? {
+        let mockData = EmptyModel()
+        
+        return ResponseBodyDTO<EmptyModel>.init(
+            success: true,
+            data: mockData,
+            error: nil
+        )
+    }
+    
     func getPromiseTardyInfo(with promiseID: Int) -> ResponseBodyDTO<TardyInfoModel>? {
         let mockData = TardyInfoModel(
             penalty: "티라미수 케익 릴스",