diff --git a/.all-contributorsrc b/.all-contributorsrc
index ff24dadd6..0aeafa60d 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -2843,6 +2843,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "hwan33",
+      "name": "YongHwan Kwon",
+      "avatar_url": "https://avatars.githubusercontent.com/u/67625677?v=4",
+      "profile": "https://hwan33.tistory.com/",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,
diff --git a/README.md b/README.md
index 935352e3d..0b1249bb4 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
 [![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-312-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-313-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
@@ -476,6 +476,7 @@ This project is licensed under the terms of the MIT license.
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/HongGeonUi"><img src="https://avatars.githubusercontent.com/u/89684956?v=4?s=100" width="100px;" alt="Hong Geon-ui"/><br /><sub><b>Hong Geon-ui</b></sub></a><br /><a href="#translation-HongGeonUi" title="Translation">🌍</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ylcn91"><img src="https://avatars.githubusercontent.com/u/7249450?v=4?s=100" width="100px;" alt="Doksanbir"/><br /><sub><b>Doksanbir</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ylcn91" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Chant3ll3"><img src="https://avatars.githubusercontent.com/u/141697333?v=4?s=100" width="100px;" alt="Chant3ll3"/><br /><sub><b>Chant3ll3</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Chant3ll3" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://hwan33.tistory.com/"><img src="https://avatars.githubusercontent.com/u/67625677?v=4?s=100" width="100px;" alt="YongHwan Kwon"/><br /><sub><b>YongHwan Kwon</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=hwan33" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>