• 
  Young-hwa Seo

  Kyeong-min's mom
• 
  Won-hee Ko

  Han-sol
• 
  Yeo-bin Jeon

  Yeong-hee
• 
  Dong-won Heo

  Detective 1
• 
  In-gi Jung

  Kyeong-min's dad
• 
  Da-Yoon Go

  Lynch clique
• 
  Ho-won Lee

  Detective 4
• 
  Min-woo Choi

  Former teacher

• 
  Gyo-sik Choi

  Director of Academic Affairs
• 
  Taekyung Lee

  Yoo-ryi
• 
  Tae-joon Kim

  Detective 2
• 
  Seon Gil Baek

  Dean of students
• 
  Bom Lee

  Da-som
• 
  Seul-ah Lee

  Lynch clique
• 
  So-hee Jeon

  Kyeong-min

• 
  In-gi Jeong

  Kyeong-min's dad
• 
  Tae-joon Kim

  Detective 2
• 
  So-nee Jeon

  Kyeong-min
• 
  Jae-Myeong Yoo

  Detective Kim
• 
  Hyun-woo Seo

  Homeroom teacher
• 
  Seul-gi Lee

  Lynch clique