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

Jung Hye-sun

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

MC