diff --git a/Nerfed.Editor/Editor/EditorGui.cs b/Nerfed.Editor/Editor/EditorGui.cs
new file mode 100644
index 0000000..8a9f6a9
--- /dev/null
+++ b/Nerfed.Editor/Editor/EditorGui.cs
@@ -0,0 +1,30 @@
+namespace Nerfed.Editor.Editor
+{
+    internal static class EditorGui
+    {
+        internal static void Initialize()
+        {
+            // Create GuiController.
+
+            // Subscribe to GUI update.
+            // GuiController.OnGui call => UpdateDock;
+            // GuiController.OnGui call => UpdateEditorWindows;
+            // GuiController.OnGui call => ...;
+        }
+
+        internal static void Update()
+        {
+            // Update GuiController.
+        }
+
+        internal static void Render()
+        {
+            // Reneder GuiController.
+        }
+
+        private static void UpdateDock()
+        {
+            // Setup default dockspace for the main window.
+        }
+    }
+}
\ No newline at end of file
diff --git a/Nerfed.Editor/Nerfed.Editor.csproj b/Nerfed.Editor/Nerfed.Editor.csproj
index cfa3c24..8aec954 100644
--- a/Nerfed.Editor/Nerfed.Editor.csproj
+++ b/Nerfed.Editor/Nerfed.Editor.csproj
@@ -23,8 +23,8 @@
     </PropertyGroup>
     
     <ItemGroup>
-        <ProjectReference Include="..\Nerfed.Runtime\Nerfed.Runtime.csproj"/>
+        <ProjectReference Include="..\Nerfed.Runtime\Nerfed.Runtime.csproj" />
     </ItemGroup>
 
-    <Import Project=".\CopyLibs.targets"/>
+    <Import Project=".\CopyLibs.targets" />
 </Project>
diff --git a/Nerfed.Editor/Program.cs b/Nerfed.Editor/Program.cs
index 7c4737d..92bbbc8 100644
--- a/Nerfed.Editor/Program.cs
+++ b/Nerfed.Editor/Program.cs
@@ -6,6 +6,33 @@ internal class Program
 {
     private static void Main(string[] args)
     {
+        Engine.OnInitialize += HandleOnInitialize;
+        Engine.OnUpdate += HandleOnUpdate;
+        Engine.OnRender += HandleOnRender;
+        Engine.OnQuit += HandleOnQuit;
+
         Engine.Run(args);
     }
-}
+
+    private static void HandleOnInitialize()
+    {
+        // Open project.
+        // Setip EditorGui.
+    }
+
+    private static void HandleOnUpdate()
+    {
+        // Editor Update.
+
+        // Try Catch UserCode Update.
+    }
+
+    private static void HandleOnRender()
+    {
+        // Editor GUI Render.
+    }
+
+    private static void HandleOnQuit()
+    {
+    }
+}
\ No newline at end of file
diff --git a/Nerfed.Runtime/Engine.cs b/Nerfed.Runtime/Engine.cs
index 8d951eb..7dd741e 100644
--- a/Nerfed.Runtime/Engine.cs
+++ b/Nerfed.Runtime/Engine.cs
@@ -1,12 +1,17 @@
-using System.Diagnostics;
 using Nerfed.Runtime.Audio;
 using Nerfed.Runtime.Graphics;
 using SDL2;
+using System.Diagnostics;
 
 namespace Nerfed.Runtime;
 
 public static class Engine
 {
+    public static event Action OnInitialize;
+    public static event Action OnUpdate;
+    public static event Action OnRender;
+    public static event Action OnQuit;
+
     public static TimeSpan MaxDeltaTime { get; set; } = TimeSpan.FromMilliseconds(100);
     public static bool VSync { get; set; }
 
@@ -65,11 +70,15 @@ public static void Run(string[] args)
 
         AudioDevice = new AudioDevice();
 
+        OnInitialize?.Invoke();
+
         while (!quit)
         {
             Tick();
         }
 
+        OnQuit?.Invoke();
+
         GraphicsDevice.UnclaimWindow(MainWindow);
         MainWindow.Dispose();
         GraphicsDevice.Dispose();
@@ -146,6 +155,7 @@ private static void Tick()
                 ProcessSDLEvents();
 
                 // Tick game here...
+                OnUpdate?.Invoke();
 
                 AudioDevice.WakeThread();
                 accumulatedUpdateTime -= Timestep;
@@ -154,6 +164,7 @@ private static void Tick()
             double alpha = accumulatedUpdateTime / Timestep;
 
             // Render here..
+            OnRender?.Invoke();
 
             accumulatedDrawTime -= framerateCapTimeSpan;
         }