Once Upon a Time in High School

A model student transfers to the notorious Jungmoon High School known for its severe corporal punishment by teachers and power struggles between school gangs.

• 
  Kwon Sang-woo

  Hyeon-su
• 
  Lee Jung-jin

  Woo-shik
• 
  Han Ga-in

  Eun-ju
• 
  Lee Jong-hyuk

  Cha Jong-hoon
• 
  Park Hyo-joon

  Ham Jae-bok
• 
  Seo Dong-won

  Seong-hun
• 
  Kim Dong-young

  Young Hyeon-su
• 
  Cho Jin-woong

  Yasaengma Gang Member
• 
  Kim In-kwon

  Jiksae
• 
  Baek Bong-ki

  Cheetah