• 
  Kap-su Kim

  Cha Young-jae
• 
  Jung-woo Ha

  Detective Cho
• 
  Sa-Pi Lee
• 
  Sang-Myeon Park

  Class teacher
• 
  Seon-a Kim

  Chun Jae-in
• 
  Beom-su Lee

  Detective working on maths exam
• 
  Yoo Gong

  No-young
• 
  Kwang-rok Oh

  Bae Doo-sang

• 
  Won-jae Lee

  scriitor
• 
  Yong-ki Jeong

  scriitor