김수로

Cheon Seong-geun

Park Bo-young

Han Song-i

Lee Chan-ho

Ok Gi-ho

김형범

Cha Seung-ryong

김기방

Meok-tong

Park Jin-Taek

Jin-gook

김영옥

Seong-geun's Mother

하정우

Doctor

Jang Hee-Su

Gi-ho's Mother

이용이

Eun-sil's Mother

Lee Hyung-Kwon

Vice-principal

Gong Ho-seok

Teacher Choi

이한위

Principal

Kim Sung-ryung

President Lee

문채원

Lee Eun-sil

Park Kwang-chun