Hyeon-su
Kwon Sang-woo
Woo-shik
Lee Jung-jin
Cheetah
Baek Bong-ki
Teacher
Ahn Nae-sang
Choi Byeong-sam
Kim Byung-choon
English Teacher
Kwon Tae-won
Hyeon-su's Father
Cheon Ho-jin
Hyun-soo's Mother
Lee Hyeon-seok
Jong-hoon's Mother
Jun Sung-ae
P.E. Teacher
Yang Han-seok
Politics & Economics Teacher
Park Soo-young
Boniface
Kim Bu-seon
Eun-ju
Han Ga-in
Student
Lee Jang-woo
Back Joo-hee
Korean crow-tit's gang
Lee Gun-moon
Cha Jong-hoon
Lee Jong-hyuk
Ham Jae-bok
Park Hyo-joon
Seong-hun
Seo Dong-won
Young Hyeon-su
Kim Dong-young
Yasaengma Gang Member
Cho Jin-woong
Yasaengma Gang Leader
Lee Gyu-ho
Jiksae
Kim In-kwon
Director
Yoo Ha
Screenplay
Assistant Editor
Pil Gam-seong
Makeup & Hair
Kim Seo-young
Fight Choreographer
Sin Jae-myeong
Executive Producer
Tcha Sung-jai
Original Music Composer
Kim Jun-seok
Cinematography
Choi Hyeon-gi
Production Design
Kim Ki-chul
Producer
Noh Jong-yun
Production Sound Mixer
Kim Kyung-tae
Special Effects Supervisor
Kim Byeong-gi
Editor
Park Gok-ji
Sound Designer
Lee In-gyu