diff --git a/SakuraVNE/src/AppLayer.cpp b/SakuraVNE/src/AppLayer.cpp
index 5f838bd..61456ee 100644
--- a/SakuraVNE/src/AppLayer.cpp
+++ b/SakuraVNE/src/AppLayer.cpp
@@ -1 +1,19 @@
 #include "AppLayer.h"
+#include "Application.h"
+#include "Layer.h"
+#include "imgui.h"
+
+AppLayer::AppLayer() : Layer("AppLayer", true) {}
+
+void AppLayer::OnImGuiRender() {
+    ImGuiIO &io = ImGui::GetIO();
+    bool demoWindow = true;
+    ImGui::Begin("Framerate");
+    ImGui::ShowDemoWindow(&demoWindow);
+    ImGui::Text("Application avg %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
+
+    if (ImGui::Button("Quit")) {
+        Application::Get().SetRunningState(false);
+    }
+    ImGui::End();
+}
diff --git a/SakuraVNE/src/AppLayer.h b/SakuraVNE/src/AppLayer.h
index f6829fb..1a5ab8b 100644
--- a/SakuraVNE/src/AppLayer.h
+++ b/SakuraVNE/src/AppLayer.h
@@ -1,8 +1,10 @@
 #include "Layer.h"
 
-class AppLayer : SakuraVNE::Layer {
+class AppLayer : public SakuraVNE::Layer {
+public:
     AppLayer();
-    virtual ~AppLayer();
+    virtual ~AppLayer() = default;
+    virtual void OnImGuiRender() override;
 
 private:
     // bool OnMouseButtonPressed(Core::MouseButtonPressedEvent &event);
diff --git a/SakuraVNE/src/main.cpp b/SakuraVNE/src/main.cpp
index 0fe0ba5..be6e35d 100644
--- a/SakuraVNE/src/main.cpp
+++ b/SakuraVNE/src/main.cpp
@@ -1,3 +1,4 @@
+#include "AppLayer.h"
 #include "Application.h"
 
 int main(int argc, char *argv[]) {
@@ -8,7 +9,7 @@ int main(int argc, char *argv[]) {
     appData.windowdata.height = 720;
 
     Application app(appData);
-    // app.PushLayer<AppLayer>();
+    app.PushLayer<AppLayer>();
     app.Run();
 
     return 0;
diff --git a/libs/SakuraCore b/libs/SakuraCore
index da3ad2e..d58ddf6 160000
--- a/libs/SakuraCore
+++ b/libs/SakuraCore
@@ -1 +1 @@
-Subproject commit da3ad2ed6167725c956ab7cd3a511eaba0092f1f
+Subproject commit d58ddf6c359ecdc1015628af87bf200bb79ececc