• 
  Woong-in Jeong

   Prison Officer Paeng
• 
  Kyung Ho Jung

   Lee Joon-ho
• 
  Krystal Jung

   Ji-ho
• 
  Moo-Seong Choi

   Kang Ki-soo
• 
  Gi-doong Kang

   Prison Officer Song
• 
  Jeong Jae-Seong

   Myunggyosoo
• 
  Min-Sung Jung

   Gobaksa
• 
  Hwa-Young Im

   Je-hee

• 
  Hae-In Jung

   Yoodaewi
• 
  Park Hae-soo

   Kim Je-hyuk
• 
  Sung-won Choi

   Jeombaki
• 
  Kim Han-Jong

   Daehyungsoji
• 
  Sung-Cheol Kim

   Beobja
• 
  Dong-il Song

  1 episode, 2017
• 
  Kim Ki Nam

  8 episodes, 2017-2018

• 
  Kim Kyung Nam

  12 episodes, 2017-2018
• 
  Kyoo-hyung Lee

  15 episodes, 2017-2018
• 
  Ahn Sang-Woo

  9 episodes, 2017-2018
• 
  Joon-Han Kim

  9 episodes, 2017-2018
• 
  Kyung-Nam Kim

  12 episodes, 2017-2018
• 
  Chang-Hwan Ahn

  8 episodes, 2017-2018
• 
  Ho-San Park

  11 episodes, 2017-2018
• 
  Moon-Sung Jung

  10 episodes, 2017-2018
• 
  Hyoungsoo Park

  11 episodes, 2017-2018
• 
  Soo-jeong Ye

  Je Hyuk's mother