diff --git a/HelloStudents/App.config b/HelloStudents/App.config
index bae5d6d..4bfa005 100644
--- a/HelloStudents/App.config
+++ b/HelloStudents/App.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
     <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/>
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/>
     </startup>
 </configuration>
diff --git a/HelloStudents/HelloStudents.csproj b/HelloStudents/HelloStudents.csproj
index 94dc10e..958c1cd 100644
--- a/HelloStudents/HelloStudents.csproj
+++ b/HelloStudents/HelloStudents.csproj
@@ -8,7 +8,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>HelloStudents</RootNamespace>
     <AssemblyName>HelloStudents</AssemblyName>
-    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <Deterministic>true</Deterministic>
@@ -48,7 +48,6 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Student3109Kim.cs" />
-    <Compile Include="MyModule1.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Student3099Ham.cs" />
@@ -67,6 +66,7 @@
     <Compile Include="Student3103Kim.cs" />
     <Compile Include="Student3116JO.cs" />
     <Compile Include="Student3199Ham.cs" />
+    <Compile Include="Student3204Kim.cs" />
     <Compile Include="Student3209Moon.cs" />
     <Compile Include="Student3214Lee.cs" />
     <Compile Include="Student3211Son.cs" />
diff --git a/HelloStudents/MyModule1.cs b/HelloStudents/MyModule1.cs
deleted file mode 100644
index af749eb..0000000
--- a/HelloStudents/MyModule1.cs
+++ /dev/null
@@ -1,34 +0,0 @@
-using System;
-using System.Web;
-
-namespace HelloStudents
-{
-    public class MyModule1 : IHttpModule
-    {
-        /// <summary>
-        /// 이 모듈을 사용하려면 먼저 웹의 Web.config 파일에서 모듈을
-        /// 구성하고 IIS에 등록해야 합니다.
-        /// 다음 링크 참조: https://go.microsoft.com/?linkid=8101007
-        /// </summary>
-        #region IHttpModule 멤버
-
-        public void Dispose()
-        {
-            //여기에서 코드를 정리합니다.
-        }
-
-        public void Init(HttpApplication context)
-        {
-            // 다음은 LogRequest 이벤트를 처리하여 사용자 지정 로깅 구현을 
-            // 이 이벤트에 제공하는 예입니다.
-            context.LogRequest += new EventHandler(OnLogRequest);
-        }
-
-        #endregion
-
-        public void OnLogRequest(Object source, EventArgs e)
-        {
-            //사용자 지정 로깅 논리를 여기에 사용할 수 있습니다.
-        }
-    }
-}
diff --git a/HelloStudents/Program.cs b/HelloStudents/Program.cs
index fac8c80..423c6e5 100644
--- a/HelloStudents/Program.cs
+++ b/HelloStudents/Program.cs
@@ -117,12 +117,6 @@ static void Main(string[] args)             // 메서드 이름 대문자
                     BaseYear = 2021
                 });
             // 3111
-            students.Add(
-                new Student3111Shin()
-                {
-                    FirstName = "잎새", LastName = "신",
-                    StudentNumber = 3111, BaseYear = 2019
-                });
             // 3112
             students.Add(
                 new Student3112Oh()
@@ -184,13 +178,6 @@ static void Main(string[] args)             // 메서드 이름 대문자
                     BaseYear = 2021
                 });
             // 3118
-            students.Add(          
-                new Student3118Choi()
-                {
-                    FirstName = "수민",
-                    LastName = "최",
-                    StudentNumber = 3118,
-                });                  
             // 3119
             // 3120
 
@@ -198,19 +185,19 @@ static void Main(string[] args)             // 메서드 이름 대문자
             // 3202
             // 3203 
             // 3204
+            students.Add(
+                new Student3204Kim()
+                {
+                    FirstName = "예은",
+                    LastName = "김",
+                    StudentNumber = 3204,
+                    BaseYear = 2022
+                });
             // 3205
             // 3206
             // 3207
             // 3208
             // 3209
-            students.Add(
-               new Student3209Kim()
-               {
-                   FirstName = "진진",
-                   LastName = "문",
-                   StudentNumber = 3209,
-                   BaseYear = 2021
-               });
             // 3210
             // 3211
             students.Add(
diff --git a/HelloStudents/Student3113Lee.cs b/HelloStudents/Student3113Lee.cs
index 57c7167..b3ba679 100644
--- a/HelloStudents/Student3113Lee.cs
+++ b/HelloStudents/Student3113Lee.cs
@@ -9,4 +9,4 @@ public override string Hello()
             return "�ȳ��ϼ���? ���� " + this + "�Դϴ�!"; 
         }
     }
-}}
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/HelloStudents/Student3204Kim.cs b/HelloStudents/Student3204Kim.cs
new file mode 100644
index 0000000..08b3597
--- /dev/null
+++ b/HelloStudents/Student3204Kim.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HelloStudents
+{
+    internal class Student3204Kim : StudentBase
+    {
+        public override string Hello()
+        {
+            return "안녕 나는 " + this +  "이양";
+        }
+    }
+}