Kim Yoo-nah
Yun-suk
Park Nam
Yun-sik
Park So-yeong
Sun-na
Kim In-jeong
Ok-i
Park Soon-cheon
Mother
Yoon Cheol-hyeong
Father
Ryu Mi-oh
Vice Principal
Kim Hyeong-il
Publisher
Baek Il-seob
Gyeong-su's Father
Kim Chung-ran
Gyeong-su's Mother
Yeo Un-gye
Doctor
Jeong Hye-seon
Principal
Jeon Won-joo
School Parent
Hong Yun-jeong
Loan Shark
Kim Il-woo
Dispatcher
Hwang Min
Korean Teacher
Seo Chang-sook
Class Teacher
Lee Dae-ro
Grandfather
Han Young-su
Yun-sik's Class Teacher
Lim Sun-taeg
MC
Kim Hye-yeong