diff --git a/GimiFeedback/GimiFeedback.xcodeproj/project.pbxproj b/GimiFeedback/GimiFeedback.xcodeproj/project.pbxproj
index 9bdee70..4b9b1f8 100644
--- a/GimiFeedback/GimiFeedback.xcodeproj/project.pbxproj
+++ b/GimiFeedback/GimiFeedback.xcodeproj/project.pbxproj
@@ -18,6 +18,9 @@
 		D306028E2E377EC500908D1D /* FeedbackWriteViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D306028C2E377EC500908D1D /* FeedbackWriteViewModel.swift */; };
 		D30602962E3782A200908D1D /* KcELECTRA-base-v2022.mlpackage in Sources */ = {isa = PBXBuildFile; fileRef = D30602952E3782A200908D1D /* KcELECTRA-base-v2022.mlpackage */; };
 		D36C43842E38A029006A027E /* TokenizerREADME.md in Resources */ = {isa = PBXBuildFile; fileRef = D36C43832E38A025006A027E /* TokenizerREADME.md */; };
+		EC25CC332E5975880087EC50 /* FirebaseAppCheck in Frameworks */ = {isa = PBXBuildFile; productRef = EC25CC322E5975880087EC50 /* FirebaseAppCheck */; };
+		EC371D842E55E9AA008E4AB7 /* GeminiManger.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC371D832E55E9AA008E4AB7 /* GeminiManger.swift */; };
+		EC371DC92E560D76008E4AB7 /* FirebaseAI in Frameworks */ = {isa = PBXBuildFile; productRef = EC371DC82E560D76008E4AB7 /* FirebaseAI */; };
 		EC6A4C842E31284F0087DB5C /* ChannelDetail+DescriptionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC6A4C832E31284F0087DB5C /* ChannelDetail+DescriptionView.swift */; };
 		EC6A4C862E3129300087DB5C /* ChannelDetail+EmptyFeedbackView.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC6A4C852E3129300087DB5C /* ChannelDetail+EmptyFeedbackView.swift */; };
 		EC6A4C882E312A3B0087DB5C /* ChannelDetail+FeedbackListView.swift in Sources */ = {isa = PBXBuildFile; fileRef = EC6A4C872E312A3B0087DB5C /* ChannelDetail+FeedbackListView.swift */; };
@@ -64,7 +67,6 @@
 		EE41FEDC2E2250DF0002E595 /* KakaoSDKAuth in Frameworks */ = {isa = PBXBuildFile; productRef = EE41FEDB2E2250DF0002E595 /* KakaoSDKAuth */; };
 		EE41FEDE2E2250DF0002E595 /* KakaoSDKCommon in Frameworks */ = {isa = PBXBuildFile; productRef = EE41FEDD2E2250DF0002E595 /* KakaoSDKCommon */; };
 		EE41FEE02E2250DF0002E595 /* KakaoSDKUser in Frameworks */ = {isa = PBXBuildFile; productRef = EE41FEDF2E2250DF0002E595 /* KakaoSDKUser */; };
-		EE41FEE52E2256280002E595 /* Config.xcconfig in Resources */ = {isa = PBXBuildFile; fileRef = EE41FEE42E2256280002E595 /* Config.xcconfig */; };
 		EE41FEE72E22572C0002E595 /* Bundle+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE41FEE62E2257260002E595 /* Bundle+Extension.swift */; };
 		EE41FEE92E2259350002E595 /* UserViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE41FEE82E2259310002E595 /* UserViewModel.swift */; };
 		EE41FEEB2E22599C0002E595 /* KakaoAuthManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE41FEEA2E2259980002E595 /* KakaoAuthManager.swift */; };
@@ -132,6 +134,7 @@
 		D306028C2E377EC500908D1D /* FeedbackWriteViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FeedbackWriteViewModel.swift; sourceTree = "<group>"; };
 		D30602952E3782A200908D1D /* KcELECTRA-base-v2022.mlpackage */ = {isa = PBXFileReference; lastKnownFileType = folder.mlpackage; path = "KcELECTRA-base-v2022.mlpackage"; sourceTree = "<group>"; };
 		D36C43832E38A025006A027E /* TokenizerREADME.md */ = {isa = PBXFileReference; lastKnownFileType = net.daringfireball.markdown; path = TokenizerREADME.md; sourceTree = "<group>"; };
+		EC371D832E55E9AA008E4AB7 /* GeminiManger.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GeminiManger.swift; sourceTree = "<group>"; };
 		EC6A4C832E31284F0087DB5C /* ChannelDetail+DescriptionView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ChannelDetail+DescriptionView.swift"; sourceTree = "<group>"; };
 		EC6A4C852E3129300087DB5C /* ChannelDetail+EmptyFeedbackView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ChannelDetail+EmptyFeedbackView.swift"; sourceTree = "<group>"; };
 		EC6A4C872E312A3B0087DB5C /* ChannelDetail+FeedbackListView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ChannelDetail+FeedbackListView.swift"; sourceTree = "<group>"; };
@@ -238,10 +241,12 @@
 				EEDBB1BE2E2913CE00F16407 /* FirebaseFunctions in Frameworks */,
 				D306027D2E377E8400908D1D /* Transformers in Frameworks */,
 				EE41FEDE2E2250DF0002E595 /* KakaoSDKCommon in Frameworks */,
+				EC25CC332E5975880087EC50 /* FirebaseAppCheck in Frameworks */,
 				EE3755462E1E5B8D009AD262 /* FirebaseAuth in Frameworks */,
 				ECC980B12E290DC4004A483B /* KakaoSDKTemplate in Frameworks */,
 				EE3755482E1E5B8D009AD262 /* FirebaseFirestore in Frameworks */,
 				EE41FEE02E2250DF0002E595 /* KakaoSDKUser in Frameworks */,
+				EC371DC92E560D76008E4AB7 /* FirebaseAI in Frameworks */,
 				EE41FEDC2E2250DF0002E595 /* KakaoSDKAuth in Frameworks */,
 				ECC980AF2E290DC4004A483B /* KakaoSDKShare in Frameworks */,
 			);
@@ -300,6 +305,15 @@
 			path = MLWeights;
 			sourceTree = "<group>";
 		};
+		EC371D822E55E99C008E4AB7 /* LLM */ = {
+			isa = PBXGroup;
+			children = (
+				EC94C0F22E3746130020E59D /* GPTManger.swift */,
+				EC371D832E55E9AA008E4AB7 /* GeminiManger.swift */,
+			);
+			path = LLM;
+			sourceTree = "<group>";
+		};
 		EC6A4C822E31274B0087DB5C /* SubViews */ = {
 			isa = PBXGroup;
 			children = (
@@ -594,7 +608,6 @@
 				EE856A4B2E1CD3AA006820B9 /* FirestoreManager.swift */,
 				EE41FEEC2E225A1C0002E595 /* FirebaseAuthManager.swift */,
 				EEDBB1BB2E28DEB900F16407 /* FCMManager.swift */,
-				EC94C0F22E3746130020E59D /* GPTManger.swift */,
 				ECC980AB2E28E91E004A483B /* DeepLinkManager.swift */,
 				ECC980B42E294835004A483B /* KakaoShareManager.swift */,
 				EE41FEEA2E2259980002E595 /* KakaoAuthManager.swift */,
@@ -667,6 +680,7 @@
 		EEFEBF592E4B7EFB001D824D /* AI */ = {
 			isa = PBXGroup;
 			children = (
+				EC371D822E55E99C008E4AB7 /* LLM */,
 				D30602832E377E9700908D1D /* MLModel */,
 				D30602892E377EA100908D1D /* MLWeights */,
 			);
@@ -701,6 +715,8 @@
 				EEDBB1B72E28D45700F16407 /* FirebaseMessaging */,
 				EEDBB1BD2E2913CE00F16407 /* FirebaseFunctions */,
 				D306027C2E377E8400908D1D /* Transformers */,
+				EC371DC82E560D76008E4AB7 /* FirebaseAI */,
+				EC25CC322E5975880087EC50 /* FirebaseAppCheck */,
 			);
 			productName = A10;
 			productReference = EE856A262E1CD093006820B9 /* GimiFeedback.app */;
@@ -714,7 +730,7 @@
 			attributes = {
 				BuildIndependentTargetsInParallel = 1;
 				LastSwiftUpdateCheck = 1630;
-				LastUpgradeCheck = 1630;
+				LastUpgradeCheck = 1640;
 				TargetAttributes = {
 					EE856A252E1CD093006820B9 = {
 						CreatedOnToolsVersion = 16.3;
@@ -751,7 +767,6 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				EE41FEE52E2256280002E595 /* Config.xcconfig in Resources */,
 				EE465EE92E26205D0096109A /* GoogleService-Info.plist in Resources */,
 				EE3754AF2E1D7B36009AD262 /* .swiftlint.yml in Resources */,
 				D36C43842E38A029006A027E /* TokenizerREADME.md in Resources */,
@@ -838,6 +853,7 @@
 				EC6A4CA52E350B720087DB5C /* Spicy+Extension.swift in Sources */,
 				EE37553D2E1E10EA009AD262 /* FeedbackContentType.swift in Sources */,
 				EE37554A2E1E5BBD009AD262 /* AppDelegate.swift in Sources */,
+				EC371D842E55E9AA008E4AB7 /* GeminiManger.swift in Sources */,
 				D30602962E3782A200908D1D /* KcELECTRA-base-v2022.mlpackage in Sources */,
 				EE3755412E1E1105009AD262 /* FeedbackChannel.swift in Sources */,
 				EE37553F2E1E10F9009AD262 /* FeedbackContent.swift in Sources */,
@@ -1145,6 +1161,16 @@
 			package = D306027B2E377E8400908D1D /* XCRemoteSwiftPackageReference "swift-transformers" */;
 			productName = Transformers;
 		};
+		EC25CC322E5975880087EC50 /* FirebaseAppCheck */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = EE3755442E1E5B8D009AD262 /* XCRemoteSwiftPackageReference "firebase-ios-sdk" */;
+			productName = FirebaseAppCheck;
+		};
+		EC371DC82E560D76008E4AB7 /* FirebaseAI */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = EE3755442E1E5B8D009AD262 /* XCRemoteSwiftPackageReference "firebase-ios-sdk" */;
+			productName = FirebaseAI;
+		};
 		ECC980AE2E290DC4004A483B /* KakaoSDKShare */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = EE41FEDA2E2250DF0002E595 /* XCRemoteSwiftPackageReference "kakao-ios-sdk" */;
diff --git a/GimiFeedback/GimiFeedback.xcodeproj/xcshareddata/xcschemes/GimiFeedback.xcscheme b/GimiFeedback/GimiFeedback.xcodeproj/xcshareddata/xcschemes/GimiFeedback.xcscheme
index 91162d9..068ecf4 100644
--- a/GimiFeedback/GimiFeedback.xcodeproj/xcshareddata/xcschemes/GimiFeedback.xcscheme
+++ b/GimiFeedback/GimiFeedback.xcodeproj/xcshareddata/xcschemes/GimiFeedback.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1630"
+   LastUpgradeVersion = "1640"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/GimiFeedback/GimiFeedback/Network/GPTManger.swift b/GimiFeedback/GimiFeedback/AI/LLM/GPTManger.swift
similarity index 100%
rename from GimiFeedback/GimiFeedback/Network/GPTManger.swift
rename to GimiFeedback/GimiFeedback/AI/LLM/GPTManger.swift
diff --git a/GimiFeedback/GimiFeedback/AI/LLM/GeminiManger.swift b/GimiFeedback/GimiFeedback/AI/LLM/GeminiManger.swift
new file mode 100644
index 0000000..2151fae
--- /dev/null
+++ b/GimiFeedback/GimiFeedback/AI/LLM/GeminiManger.swift
@@ -0,0 +1,52 @@
+import Foundation
+import FirebaseAI
+
+final class GeminiManger {
+    static let shared = GeminiManger()
+    
+    private let model: GenerativeModel?
+    
+    private init() {
+        let firebaseService = FirebaseAI.firebaseAI(backend: .googleAI())
+        model = firebaseService.generativeModel(
+            modelName: "gemini-2.5-flash",
+            systemInstruction: ModelContent(role: "system", parts: systemPrompt))
+    }
+    
+    let systemPrompt = """
+    너는 어떤 피드백이든 무조건 부드럽고 배려 있는 말로 순화하는 전문가야.
+    너의 유일한 임무는 사용자 피드백을 공감적인 말투로 바꾸는 것이며, 이외의 추가적인 대화나 설명은 절대 하지 마.
+    
+    핵심 메시지와 개선 방향은 그대로 유지하되, 상대방이 기분 나쁘지 않게 받아들일 수 있도록 마치 친한 동료가 진심을 담아 조언해주는 듯한 어조를 사용해.
+    긍정적이거나 이미 부드러운 피드백이더라도, 더 따뜻하고 공감적인 표현으로 다듬어서 결과물만 출력해.
+    
+    아래는 예시야:
+    
+    <예시>
+        <입력 예시>회의 시간에 집중 좀 해. 계속 딴짓해서 짜증나.</입력 예시>
+        <출력 예시>회의에 더 집중해주면 좋겠어요. 가끔 딴짓하는 모습이 보여서 회의 흐름이 조금 끊기는 느낌이 있었어요.</출력 예시>
+    </예시>
+    
+    <예시>
+        <입력 예시>일을 너무 느리게 해. 같이 일하기 힘들어.</입력 예시>
+        <출력 예시>업무 속도가 조금 더 빨라지면 협업이 훨씬 원활할 것 같아요. 지금도 충분히 잘하고 있지만, 약간만 더 신경 써주면 좋겠어요.</출력 예시>
+    </예시>
+    
+    <예시>
+        <입력 예시>말이 너무 많고 눈치가 없어서 분위기 망치고 있어.</입력 예시>
+        <출력 예시>이야기를 적극적으로 해주는 건 좋지만, 상황에 맞게 조절해주면 더 좋은 분위기가 될 수 있을 것 같아요.</출력 예시>
+    </예시>
+    
+    위와 같이, 표현은 순화하지만 피드백의 본질은 흐리지 않도록 해줘.
+    """
+    
+}
+
+extension GeminiManger {
+    func generate(inputText: String) async throws -> String {
+        guard let model else { return "" }
+        
+        let response = try await model.generateContent(inputText)
+        return response.text ?? ""
+    }
+}
diff --git a/GimiFeedback/GimiFeedback/App/AppDelegate.swift b/GimiFeedback/GimiFeedback/App/AppDelegate.swift
index 7beba06..5e4f87f 100644
--- a/GimiFeedback/GimiFeedback/App/AppDelegate.swift
+++ b/GimiFeedback/GimiFeedback/App/AppDelegate.swift
@@ -9,6 +9,7 @@ import SwiftUI
 import FirebaseCore
 import UserNotifications
 import FirebaseMessaging
+import FirebaseAppCheck
 
 final class AppDelegate: NSObject, UIApplicationDelegate {
     var saveUserInfo: [AnyHashable: Any]?
@@ -17,6 +18,10 @@ final class AppDelegate: NSObject, UIApplicationDelegate {
         _ application: UIApplication,
         didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil
     ) -> Bool {
+        
+        let providerFactory = YourAppCheckProviderFactory()
+        AppCheck.setAppCheckProviderFactory(providerFactory)
+        
         FirebaseApp.configure()
         setUIAppearance()
         
@@ -134,3 +139,14 @@ extension AppDelegate {
         )
     }
 }
+
+final class YourAppCheckProviderFactory: NSObject, AppCheckProviderFactory {
+    func createProvider(with app: FirebaseApp) -> AppCheckProvider? {
+        // 시뮬레이터 환경에서는 AppCheckDebugProvider를 사용하도록 설정합니다.
+        #if targetEnvironment(simulator)
+        return AppCheckDebugProvider(app: app)
+        #else
+        return AppAttestProvider(app: app)
+        #endif
+    }
+}
diff --git a/GimiFeedback/GimiFeedback/App/GimiFeedback.entitlements b/GimiFeedback/GimiFeedback/App/GimiFeedback.entitlements
index 903def2..d2ae5a1 100644
--- a/GimiFeedback/GimiFeedback/App/GimiFeedback.entitlements
+++ b/GimiFeedback/GimiFeedback/App/GimiFeedback.entitlements
@@ -4,5 +4,7 @@
 <dict>
 	<key>aps-environment</key>
 	<string>development</string>
+	<key>com.apple.developer.devicecheck.appattest-environment</key>
+	<string>production</string>
 </dict>
 </plist>
diff --git a/GimiFeedback/GimiFeedback/Presentation/FeedbackDetail/FeedbackDetailViewModel.swift b/GimiFeedback/GimiFeedback/Presentation/FeedbackDetail/FeedbackDetailViewModel.swift
index ba03ad1..425c0e1 100644
--- a/GimiFeedback/GimiFeedback/Presentation/FeedbackDetail/FeedbackDetailViewModel.swift
+++ b/GimiFeedback/GimiFeedback/Presentation/FeedbackDetail/FeedbackDetailViewModel.swift
@@ -73,7 +73,7 @@ extension FeedbackDetailViewModel {
     private func transFeedbackContent(content: FeedbackContent) {
         Task {
             isTransLoading = true
-            let response = try await GPTManger.shared.sendChatCompletion(inputText: content.content)
+            let response = try await GeminiManger.shared.generate(inputText: content.content)
                     
             guard let index = feedbackItem.content.firstIndex(where: { $0.id == content.id }) else { return }