diff --git a/design_pattern/.idea/gradle.xml b/design_pattern/.idea/gradle.xml
index 14746e7..2a65317 100644
--- a/design_pattern/.idea/gradle.xml
+++ b/design_pattern/.idea/gradle.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
diff --git a/design_pattern/src/main/java/honggi/Clipboard.java b/design_pattern/src/main/java/honggi/Clipboard.java
new file mode 100644
index 0000000..90eb364
--- /dev/null
+++ b/design_pattern/src/main/java/honggi/Clipboard.java
@@ -0,0 +1,13 @@
+package honggi;
+
+public class Clipboard {
+    private String text = "";
+
+    public String getText() {
+        return text;
+    }
+
+    public void setText(String text) {
+        this.text = text;
+    }
+}
diff --git a/design_pattern/src/main/java/honggi/CopySubscriber.java b/design_pattern/src/main/java/honggi/CopySubscriber.java
new file mode 100644
index 0000000..70c317b
--- /dev/null
+++ b/design_pattern/src/main/java/honggi/CopySubscriber.java
@@ -0,0 +1,18 @@
+package honggi;
+
+public class CopySubscriber implements KeyboardSubscriber {
+
+    private final Clipboard clipboard;
+
+    public CopySubscriber(Clipboard clipboard) {
+        this.clipboard = clipboard;
+    }
+
+    @Override
+    public void onKeyClick(String keyCode, boolean isCtrlDown, String selected) {
+        if (isCtrlDown && keyCode.equals("c")) {
+            clipboard.setText(selected);
+            System.out.println("클립보드에 내용이 복사되었습니다.");
+        }
+    }
+}
diff --git a/design_pattern/src/main/java/honggi/KeyboardPublisher.java b/design_pattern/src/main/java/honggi/KeyboardPublisher.java
new file mode 100644
index 0000000..5ecb367
--- /dev/null
+++ b/design_pattern/src/main/java/honggi/KeyboardPublisher.java
@@ -0,0 +1,25 @@
+package honggi;
+
+import java.util.ArrayList;
+
+/**
+ * 키보드 입력을 관리합니다.
+ */
+public class KeyboardPublisher {
+
+    private ArrayList<KeyboardSubscriber> subscribers = new ArrayList<>();
+    public void addSubscriber(KeyboardSubscriber subscriber) {
+        // 구독되어 있지 않다면 구독 추가
+        if (!subscribers.contains(subscriber)) subscribers.add(subscriber);
+    }
+    public void removeSubscriber(KeyboardSubscriber subscriber) {
+        subscribers.remove(subscriber);
+    }
+
+    // 클릭 발생
+    public void click(String keyCode, boolean isCtrlDown, String selected) {
+        for (KeyboardSubscriber subscriber : subscribers) {
+            subscriber.onKeyClick(keyCode, isCtrlDown, selected);
+        }
+    }
+}
diff --git a/design_pattern/src/main/java/honggi/KeyboardSubscriber.java b/design_pattern/src/main/java/honggi/KeyboardSubscriber.java
new file mode 100644
index 0000000..9f03d9f
--- /dev/null
+++ b/design_pattern/src/main/java/honggi/KeyboardSubscriber.java
@@ -0,0 +1,5 @@
+package honggi;
+
+public interface KeyboardSubscriber {
+    void onKeyClick(String keyCode, boolean isCtrlDown, String selected);
+}
diff --git a/design_pattern/src/main/java/honggi/MuteSubscriber.java b/design_pattern/src/main/java/honggi/MuteSubscriber.java
new file mode 100644
index 0000000..d144128
--- /dev/null
+++ b/design_pattern/src/main/java/honggi/MuteSubscriber.java
@@ -0,0 +1,21 @@
+package honggi;
+
+/**
+ * 동영상을 음소거하거나 음소거를 해제합니다.
+ */
+public class MuteSubscriber implements KeyboardSubscriber {
+
+    private boolean isMuted = false;
+
+    @Override
+    public void onKeyClick(String keyCode, boolean isCtrlDown, String selected) {
+        if (!isCtrlDown && keyCode.equals("m")) {
+            if (isMuted)
+                System.out.println("동영상 음소거가 해제되었습니다.");
+            else
+                System.out.println("동영상이 음소거되었습니다.");
+
+            isMuted = !isMuted;
+        }
+    }
+}
diff --git a/design_pattern/src/main/java/honggi/PasteSubscriber.java b/design_pattern/src/main/java/honggi/PasteSubscriber.java
new file mode 100644
index 0000000..34b63fd
--- /dev/null
+++ b/design_pattern/src/main/java/honggi/PasteSubscriber.java
@@ -0,0 +1,17 @@
+package honggi;
+
+public class PasteSubscriber implements KeyboardSubscriber {
+
+    private final Clipboard clipboard;
+
+    public PasteSubscriber(Clipboard clipboard) {
+        this.clipboard = clipboard;
+    }
+
+    @Override
+    public void onKeyClick(String keyCode, boolean isCtrlDown, String selected) {
+        if (isCtrlDown && keyCode.equals("v")) {
+            System.out.println("클립보드 내용(" + clipboard.getText() + ")을 붙여넣었습니다.");
+        }
+    }
+}