diff --git a/Helper/AlertProtocol/AlertProtocol.swift b/Helper/AlertProtocol/AlertProtocol.swift
new file mode 100644
index 0000000..a28ce20
--- /dev/null
+++ b/Helper/AlertProtocol/AlertProtocol.swift
@@ -0,0 +1,44 @@
+//
+//  AlertProtocol.swift
+//  VariousManagerDemoApp
+//
+//  Created by JungpyoHong on 4/21/21.
+//
+import UIKit
+
+enum AlertButton: String {
+    case ok
+    case cancel
+    case delete
+    case settings
+}
+
+protocol AlertProtocol: UIViewController {
+    func showAlert(title: String, message: String, buttons: [AlertButton], completion: @escaping (UIAlertController, AlertButton) -> Void)
+}
+
+extension AlertProtocol {
+    
+    func showAlert(title: String, message: String, buttons: [AlertButton] = [.ok], completion: @escaping (UIAlertController, AlertButton) -> Void) {
+        
+        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        
+        buttons.forEach { button in
+            let action = UIAlertAction(title: button.rawValue.capitalized, style: button == .delete ? .destructive : .default) { [alert, button] _ in
+                completion(alert, button)
+            }
+            alert.addAction(action)
+        }
+        self.present(alert, animated: true, completion: nil)
+    }
+}
+
+protocol CellReusable {
+    static var identifier: String { get }
+}
+
+extension CellReusable {
+    static var identifier: String {
+        String(describing: self)
+    }
+}