Sul Kyung-gu

Kang Ho-chang

Chun Woo-hee

Song Jung-wook

Moon So-ri

Gun-woo's mother

Oh Dal-su

Do Ji-yeol

Ko Chang-seok

Teacher Jung

Kang Shin-il

Principal

Seong Yu-bin

Kang Han-gyeol

Nam Kee-ae

Gyu-beom's grandmother

Lee Mi-eun

E-den's mother

Yoo Jae-sang

Gun-woo

Jung Yoo-ahn

Yoon-jae

Jeong Taek-hyeon

E-den

Roh Jeong-eui

Ji-ho

Jung Seung-kil

Police

Lee Bong-gyu

Kim Seung-o

(uncredited)

Choi Sun-ja