diff --git a/BasicGramms/BasicGramms/BasicEvent.cs b/BasicGramms/BasicGramms/BasicEvent.cs
index 268df7a..db42851 100644
--- a/BasicGramms/BasicGramms/BasicEvent.cs
+++ b/BasicGramms/BasicGramms/BasicEvent.cs
@@ -10,7 +10,8 @@ namespace BasicGramms
 
 	internal class BasicEvent
 	{
-		public event Handler EV;
+		//public event Handler EV; // event 키워드가 없는 경우, 클래스 외부에서 함수 직접 호출이 가능하게됨. (OOP 위반)
+		public Handler EV;
 
 		public void DoTest()
 		{
@@ -25,9 +26,32 @@ namespace BasicGramms
 			EV($"Event message: {msg}");
 		}
 
-		public void WriteConosle(string msg)
+		private void WriteConosle(string msg)
 		{
 			Console.WriteLine(msg);
 		}
 	}
+
+	internal class BasicEventUser
+	{
+		private BasicEvent Basic = new BasicEvent();
+		
+		public BasicEventUser()
+		{
+			this.Basic.EV += WriteConsole;
+			this.Basic.EV += WriteConsole;
+			this.Basic.EV += WriteConsole;
+		}
+
+		public void DoTest()
+		{
+			Basic.EV("Test done");
+		}
+		
+		private void WriteConsole(string msg)
+		{
+			Console.WriteLine($"ByUser: {msg}");
+		}
+		
+	}
 }
diff --git a/BasicGramms/BasicGramms/BasicGramms.csproj b/BasicGramms/BasicGramms/BasicGramms.csproj
index 9b5a9d1..c053c63 100644
--- a/BasicGramms/BasicGramms/BasicGramms.csproj
+++ b/BasicGramms/BasicGramms/BasicGramms.csproj
@@ -44,6 +44,7 @@
   <ItemGroup>
     <Compile Include="BasicDelegate.cs" />
     <Compile Include="BasicEvent.cs" />
+    <Compile Include="BasicLambda.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
diff --git a/BasicGramms/BasicGramms/Program.cs b/BasicGramms/BasicGramms/Program.cs
index fd0fd39..8e9378c 100644
--- a/BasicGramms/BasicGramms/Program.cs
+++ b/BasicGramms/BasicGramms/Program.cs
@@ -13,8 +13,11 @@ namespace BasicGramms
 			//BasicDelegate del = new BasicDelegate();
 			//del.DoTest();
 
-			BasicEvent evt = new BasicEvent();
-			evt.DoTest();
+			//BasicEvent evt = new BasicEvent();
+			//evt.DoTest();
+
+			BasicEventUser evtUser = new BasicEventUser();
+			evtUser.DoTest();
 
 			Console.ReadKey();
 		}