diff --git a/Diary.xcodeproj/project.pbxproj b/Diary.xcodeproj/project.pbxproj
index d6bd7f41e..7c50a4682 100644
--- a/Diary.xcodeproj/project.pbxproj
+++ b/Diary.xcodeproj/project.pbxproj
@@ -11,6 +11,7 @@
 		78274D9A2A9E26DF00AD4F50 /* DiaryCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 78274D992A9E26DF00AD4F50 /* DiaryCell.swift */; };
 		78274DA12A9E3E8E00AD4F50 /* DiaryModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 78274DA02A9E3E8E00AD4F50 /* DiaryModel.swift */; };
 		78274DA42A9F3F0A00AD4F50 /* DateFormatter+.swift in Sources */ = {isa = PBXBuildFile; fileRef = 78274DA32A9F3F0A00AD4F50 /* DateFormatter+.swift */; };
+		782FB0992AB4B6C500BC8C12 /* Toastable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 782FB0982AB4B6C500BC8C12 /* Toastable.swift */; };
 		784F30C92AB2F88F009A895B /* Location.swift in Sources */ = {isa = PBXBuildFile; fileRef = 784F30C82AB2F88F009A895B /* Location.swift */; };
 		784F30CB2AB2FE87009A895B /* DecodingManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 784F30CA2AB2FE87009A895B /* DecodingManager.swift */; };
 		784F30CE2AB30072009A895B /* DecodingError.swift in Sources */ = {isa = PBXBuildFile; fileRef = 784F30CD2AB30072009A895B /* DecodingError.swift */; };
@@ -44,6 +45,7 @@
 		78274D992A9E26DF00AD4F50 /* DiaryCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DiaryCell.swift; sourceTree = "<group>"; };
 		78274DA02A9E3E8E00AD4F50 /* DiaryModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DiaryModel.swift; sourceTree = "<group>"; };
 		78274DA32A9F3F0A00AD4F50 /* DateFormatter+.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "DateFormatter+.swift"; sourceTree = "<group>"; };
+		782FB0982AB4B6C500BC8C12 /* Toastable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Toastable.swift; sourceTree = "<group>"; };
 		784F30C82AB2F88F009A895B /* Location.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Location.swift; sourceTree = "<group>"; };
 		784F30CA2AB2FE87009A895B /* DecodingManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DecodingManager.swift; sourceTree = "<group>"; };
 		784F30CD2AB30072009A895B /* DecodingError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DecodingError.swift; sourceTree = "<group>"; };
@@ -182,6 +184,7 @@
 			isa = PBXGroup;
 			children = (
 				9C1529102AAE140800F3203E /* Shareable.swift */,
+				782FB0982AB4B6C500BC8C12 /* Toastable.swift */,
 			);
 			path = Protocol;
 			sourceTree = "<group>";
@@ -376,6 +379,7 @@
 				78274DA42A9F3F0A00AD4F50 /* DateFormatter+.swift in Sources */,
 				9C5C42F42AB36F6B004FF07A /* CacheStore.swift in Sources */,
 				C739AE27284DF28600741E8F /* SceneDelegate.swift in Sources */,
+				782FB0992AB4B6C500BC8C12 /* Toastable.swift in Sources */,
 				9C4621EC2AB06890004ED11A /* PersistentContainer.swift in Sources */,
 				784F30C92AB2F88F009A895B /* Location.swift in Sources */,
 				784F30CB2AB2FE87009A895B /* DecodingManager.swift in Sources */,
diff --git a/Diary/Controller/DiaryDetailViewController.swift b/Diary/Controller/DiaryDetailViewController.swift
index 750588457..261656e91 100644
--- a/Diary/Controller/DiaryDetailViewController.swift
+++ b/Diary/Controller/DiaryDetailViewController.swift
@@ -29,6 +29,7 @@ final class DiaryDetailViewController: UIViewController, Shareable {
     override func viewDidLoad() {
         super.viewDidLoad()
         configure()
+        configureToast()
         fetchWeather()
     }
     
@@ -183,6 +184,38 @@ private extension DiaryDetailViewController {
     }
 }
 
+extension DiaryDetailViewController: Toastable {
+    func configureToast() {
+        APIKey.delegate = self
+    }
+    
+    func showToast(message: String) {
+        let toastLabel = UILabel(frame: CGRect(
+            x: self.view.frame.size.width / 2 - 100,
+            y: self.view.frame.size.height / 2 - 35,
+            width: 200,
+            height: 70
+        ))
+        
+        toastLabel.backgroundColor = UIColor.systemGray
+        toastLabel.textColor = UIColor.white
+        toastLabel.font = UIFont.preferredFont(forTextStyle: .body)
+        toastLabel.textAlignment = .center
+        toastLabel.text = message
+        toastLabel.alpha = 1.0
+        toastLabel.layer.cornerRadius = 10
+        toastLabel.clipsToBounds = true
+        toastLabel.numberOfLines = 0
+        
+        view.addSubview(toastLabel)
+        UIView.animate(withDuration: 5.0, delay: 0.1, options: .curveEaseOut, animations: {
+            toastLabel.alpha = 0.0
+        }, completion: { _ in
+            toastLabel.removeFromSuperview()
+        })
+    }
+}
+
 private extension DiaryDetailViewController {
     func fetchWeather() {
         guard let latitude, let longitude else {
diff --git a/Diary/Network/Model/URLComponents.swift b/Diary/Network/Model/URLComponents.swift
index e73506597..308237ef9 100644
--- a/Diary/Network/Model/URLComponents.swift
+++ b/Diary/Network/Model/URLComponents.swift
@@ -47,11 +47,13 @@ enum Query {
 }
 
 enum APIKey {
+    static var delegate: Toastable?
     static var weather: String {
         guard let file = Bundle.main.path(forResource: "WeatherInfo", ofType: "plist"),
               let resource = NSDictionary(contentsOfFile: file),
               let key = resource["API_KEY"] as? String else {
-            fatalError("⛔️ API KEY를 가져오는데 실패하였습니다.")
+            delegate?.showToast(message: "⛔️ API KEY를 가져오는데 실패하였습니다.")
+            return "⛔️ API KEY를 가져오는데 실패하였습니다."
         }
         
         return key
diff --git a/Diary/Protocol/Toastable.swift b/Diary/Protocol/Toastable.swift
new file mode 100644
index 000000000..b21b9f088
--- /dev/null
+++ b/Diary/Protocol/Toastable.swift
@@ -0,0 +1,10 @@
+//
+//  Toastable.swift
+//  Diary
+//
+//  Created by hoon, karen on 2023/09/16.
+//
+
+protocol Toastable {
+    func showToast(message: String)
+}