Jang Hyuk

Kim Kyung-soo

Shin Min-a

Yoo Chae-yi

Kim Hyeong-jong

Shimma

Byun Hee-bong

Jang Hak-sa

Huh Joon-ho

Mr. Ma

Gong Hyo-jin

So Yo-seon

Kim Soo-ro

Jang Ryang

Kwon Sang-woo

Song Hak-rim

Cho Seong-ha

Korean Language Teacher

Seo Beom-sik

Athletics

Jung Sang-hoon

Con Cho

Yun Mun-sik

Principal

Lee Yu-mi

Kyung-soo's sister

Park Dong-bin

Music teacher

Shin Cheol-jin

Chinese teacher

Jung Won-joong

School Nurse

Jo Sang-geon

Kyung-soo's father

Kim Il-woo

Head of Student Affairs

Kim Tae-gyun

Director

Seo Dong-heon

Writer

Kim Tae-gyun

Writer

Jang Seong-ho

Visual Effects Supervisor

Choi Sae-mi

Costume Designer

Park Young

Sound

Kim Kyeong-hie

Art Direction

Jack Maeby

Producer

Kim Won-jung

Stunt Coordinator

Choi Yeong-taek

Director of Photography

Ko Im-pyo

Editor

Park Hun-soo

Writer

Heo Gyun

Writer

Jang An-cheol

Writer

Jang Geun-yeong

Production Design

Tcha Sung-jai

Producer

Jung Young-min

Lighting Director