Countdown

A former medalist who is now a troublemaker physical educations teacher and a natural born rebel take a satisfying whack at life.

• 
  Jin Sun-kyu

  Si-heon
• 
  Sung Yoo-bin

  Yoon-woo
• 
  Oh Na-ra

  Il-sun
• 
  Ko Chang-seok

  Principal
• 
  Jang Dong-ju

  Hwan-ju
• 
  Ko Kyu-pil

  Man-deok
• 
  Kim Min-ho

  Bok-an
• 
  Lee Jong-hwa

  Gao
• 
  Choi Hyung-tae

  Bok-co
• 
  Cho Jung-hun

  Jody