Kim Yoo-nah
— Yun-suk
Park Nam
— Yun-sik
Park So-yeong
— Sun-na
Kim In-jeong
— Ok-i
박순천
— Mother
윤철형
— Father
Ryu Mi-oh
— Vice Principal
김형일
— Publisher
백일섭
— Gyeong-su's Father
김정란
— Gyeong-su's Mother
여운계
— Doctor
정혜선
— Principal
전원주
— School Parent
Hong Yun-jeong
— Loan Shark
김일우
— Dispatcher
Hwang Min
— Korean Teacher
Seo Chang-sook
— Class Teacher
이대로
— Grandfather
한영수
— Yun-sik's Class Teacher
Lim Sun-taeg
— MC
김혜영
— MC