A mentally challenged boy, Dong-gu loves going to school to fetch water for his friends. But he is disappointed, when the school decides to install water purifiers instead.
| Actor | Role |
|---|---|
 Jung Jin-youngHur Jin-gyu | Hur Jin-gyu |
 Choi Woo-hyukDong-gu | Dong-gu |
 Yun ChanJoon-tae | Joon-tae |
 Shin Jung-keunSang-chul | Sang-chul |
 Kwon Oh-joongCoach Kwon | Coach Kwon |
 Mun Ka-youngOh Ye-ryung | Oh Ye-ryung |
 Kim Byong-chulUmpire | Umpire |
 Lee Won-jongReal Estate Company President | Real Estate Company President |
 Kim Kwang-shikFried Chicken Delivery Man | Fried Chicken Delivery Man |
| LLee Joon-heeBaseball Club Member | Baseball Club Member |
| WWon Jang-huiMin-soo | Min-soo |
| LLee Ye-wonTeacher | Teacher |
| KKim Tan-hyeonOwner's son | Owner's son |
 Park Yeon-ahMi-na | Mi-na |
 Jeon So-hyunPresident of the Women's Association | President of the Women's Association |
 Yum Dong-hunChemist | Chemist |
 Kim Ho-jungOwner's wife | Owner's wife |