| Actor | Role |
|---|---|
| KKim Yoo-nahYun-suk | Yun-suk |
| PPark NamYun-sik | Yun-sik |
| PPark So-yeongSun-na | Sun-na |
| KKim In-jeongOk-i | Ok-i |
 Park Soon-cheonMother | Mother |
| YYoon Cheol-hyeongFather | Father |
| RRyu Mi-ohVice Principal | Vice Principal |
 Kim Hyeong-ilPublisher | Publisher |
 Baek Il-seobGyeong-su's Father | Gyeong-su's Father |
| KKim Chung-ranGyeong-su's Mother | Gyeong-su's Mother |
 Yeo Un-gyeDoctor | Doctor |
 Jeong Hye-seonPrincipal | Principal |
 Jeon Won-jooSchool Parent | School Parent |
| HHong Yun-jeongLoan Shark | Loan Shark |
 Kim Il-wooDispatcher | Dispatcher |
| HHwang MinKorean Teacher | Korean Teacher |
| SSeo Chang-sookClass Teacher | Class Teacher |
 Lee Dae-roGrandfather | Grandfather |
| HHan Young-suYun-sik's Class Teacher | Yun-sik's Class Teacher |
| LLim Sun-taegMC | MC |
| KKim Hye-yeongMC | MC |