Choo Young-woo

Kim Jae-won

Shin Sia

Han Seo-yoon

Cho Yu-jung

Choi Ji-min

Jin Ho-eun

Jeong Tae-hoon

Cho Han-cheul

Kim Seong-hyeon

Lee Chae-kyung

Doctor

Jang Yoo-sang

Korean Teacher

Yun Ki-chang

Math Teacher

Yoo Ah-reum

Jae-won's Mother

Lee Gyeong-hwa

Seo-yoon's Mother

Ryu Sun-gyu

Seo-yoon's father

Moon Jeong-hyeon

Koo Dong-sik

Park Jae-hyeon

Troubled Student 1

Moon Si-hwan

Troubled Student 2

Lee Heon-jin

Troubled Student 3