• 
  Kyeong-yeong Lee

   (2017)
• 
  Jun-hyuk Lee

   (2017)
• 
  Hye-Sun Shin

   (2017)
• 
  Seung-woo Cho

   Hwang Shi-Mok (2017) (unknown episodes)
• 
  Doona Bae

   Han Yeo-Jin (16 episodes, 2017)
• 
  Se-ah Yun

   Lee Yeon-Jae (16 episodes, 2017)
• 
  Jae-woong Choi

   Jang Geon (16 episodes, 2017)
• 
  Jae-Myeong Yoo

   Lee Chang-Joon (16 episodes, 2017)

• 
  Kyoo-hyung Lee

  14 episodes, 2017
• 
  Ji-Ho Song

  Park Soon Chang
• 
  Tae-Hyung Lee

  Investigator Kim Ho Sub
• 
  Yoon Jong-In

  Seo Sang Won
• 
  Dong-won Seo

  Kim Jeong Bon
• 
  Hye-jin Jeon

  Choi Bit
• 
  Bae-soo Jeon

  Choi Yoon Soo

• 
  Moo-Seong Choi

  Woo Tae Ha
• 
  Park Sung-Geun

  Kang Won Cheol
• 
  So-Ra Kim

  Assisting Officer Choi Young
• 
  Yeong-jae Kim

  Kim Sa Hyun
• 
  Yull Jang

  Yoo Jung Oh [Detective] (2020)