diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md b/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md
index 8eb2da2..00d7130 100644
--- a/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md	
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/README.md	
@@ -93,6 +93,13 @@
 
 ### 데코레이터(Decorator) 패턴
 
+#### 구현 요구사항
+
+- 용사는 검을 가진다.
+- 용사는 검을 바꿀 수 있다.
+- 검에는 속성이 부여될 수 있으며, 속성에 따라 공격이 변한다.
+- 용사가 공격하면 소지한 무기의 공격이 발동된다.
+
 ### 프록시(Proxy) 패턴
 
 #### 구현 요구사항
@@ -118,8 +125,8 @@
 #### 구현 요구사항
 
 - 주문의 상태가 변경되면 배송팀과 운영팀에 알리고, 각각의 팀은 그에 따른 조치를 취한다.
-  - 배송팀은 배송을 시작한다.
-  - 운영팀은 고객에게 메시지를 전송한다.
+    - 배송팀은 배송을 시작한다.
+    - 운영팀은 고객에게 메시지를 전송한다.
 - 배송팀과 운영팀 외에 다른 팀에도 필요하다면 또 다른 팀에 메시지를 전송해야 할 수도 있다.
 
 ### 미디에이터(Mediator) 패턴
@@ -136,8 +143,8 @@
 
 - 회원의 모든 정보를 조회한다.
 - 회원의 모든 정보에는 회원의 기본 정보와 친구들에 대한 정보가 있다.
-  - 회원의 기본 정보에는 이름, 나이가 있다.
-  - 회원의 친구 정보에는 친구의 이름, 나이가 있다.
+    - 회원의 기본 정보에는 이름, 나이가 있다.
+    - 회원의 친구 정보에는 친구의 이름, 나이가 있다.
 
 ### 추상 팩토리(Abstract Factory) 패턴
 
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Fire.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Fire.kt
new file mode 100644
index 0000000..73dc3f2
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Fire.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class Fire(private val sword: Sword) : SwordDecorator() {
+    override fun skill(): String {
+        return "불꽃 ${sword.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/HeroApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/HeroApplication.kt
new file mode 100644
index 0000000..d7b635a
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/HeroApplication.kt	
@@ -0,0 +1,23 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Hero
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class HeroApplication
+
+fun main() {
+    val hero = Hero()
+    hero.attack()
+
+    val fireSword = Fire(Sword.DEFAULT)
+    hero.changeSword(fireSword)
+    hero.attack()
+
+    val iceSword = Ice(Sword.DEFAULT)
+    hero.changeSword(iceSword)
+    hero.attack()
+
+    val fireIceSword = Fire(Ice(Sword.DEFAULT))
+    hero.changeSword(fireIceSword)
+    hero.attack()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Ice.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Ice.kt
new file mode 100644
index 0000000..726c1a7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/Ice.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class Ice(private val sword: Sword) : SwordDecorator() {
+    override fun skill(): String {
+        return "얼음 ${sword.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/SwordDecorator.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/SwordDecorator.kt
new file mode 100644
index 0000000..e1ced59
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/after/SwordDecorator.kt	
@@ -0,0 +1,5 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.after
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+abstract class SwordDecorator : Sword()
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireIceSword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireIceSword.kt
new file mode 100644
index 0000000..6e9b463
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireIceSword.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class FireIceSword : Sword() {
+    override fun skill(): String {
+        return "화염 얼음 ${DEFAULT.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireSword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireSword.kt
new file mode 100644
index 0000000..f6c3306
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/FireSword.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class FireSword : Sword() {
+    override fun skill(): String {
+        return "화염 ${DEFAULT.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/HeroApplication.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/HeroApplication.kt
new file mode 100644
index 0000000..5223d16
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/HeroApplication.kt	
@@ -0,0 +1,22 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Hero
+
+class HeroApplication
+
+fun main() {
+    val hero = Hero()
+    hero.attack()
+
+    val fireSword = FireSword()
+    hero.changeSword(fireSword)
+    hero.attack()
+
+    val iceSword = IceSword()
+    hero.changeSword(iceSword)
+    hero.attack()
+
+    val fireIceSword = FireIceSword()
+    hero.changeSword(fireIceSword)
+    hero.attack()
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/IceSword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/IceSword.kt
new file mode 100644
index 0000000..1ebe6f7
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/before/IceSword.kt	
@@ -0,0 +1,9 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.before
+
+import com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common.Sword
+
+class IceSword : Sword() {
+    override fun skill(): String {
+        return "얼음 ${DEFAULT.skill()}"
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Hero.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Hero.kt
new file mode 100644
index 0000000..ff38811
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Hero.kt	
@@ -0,0 +1,14 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common
+
+class Hero(
+    private var sword: Sword = Sword.DEFAULT
+) {
+    fun changeSword(sword: Sword) {
+        this.sword = sword
+    }
+
+    fun attack() {
+        val swordSkill = sword.skill()
+        println("용사가 [$swordSkill]을 발동합니다.")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Sword.kt b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Sword.kt
new file mode 100644
index 0000000..5d622f6
--- /dev/null
+++ b/놀이터(예제 코드 작성)/solid-design-pattern-sample/src/main/kotlin/com/banjjoknim/soliddesignpatternsample/designpattern/decorator/common/Sword.kt	
@@ -0,0 +1,13 @@
+package com.banjjoknim.soliddesignpatternsample.designpattern.decorator.common
+
+abstract class Sword {
+    abstract fun skill(): String
+
+    companion object {
+        val DEFAULT = object : Sword() {
+            override fun skill(): String {
+                return "참격"
+            }
+        }
+    }
+}