• 
  Seung-Yeon Gong

   Eun Yi-soo (unknown episodes)
• 
  Ji-won Ye

   Dang Yoo-hee (15 episodes, 2017)
• 
  Ye-ryeong Kim

   Hwan-ki's mother (9 episodes, 2017)
• 
  Eung-soo Kim

   Hwan-ki's father (14 episodes, 2017)
• 
  Hie-jin Jang

   Seo Yeon-jung (8 episodes, 2017)
• 
  Han Chae-Ah

   Chae Ji-hye (8 episodes, 2017)
• 
  Jun Hyo-Seong

   Kim Gyo-ri (15 episodes, 2017)
• 
  Woo Jin Yeon

   Eun Hwan-ki (16 episodes, 2017)

• 
  Yoon Park

   Kang Woo-il (16 episodes, 2017)
• 
  Park Hye-soo

   Chae Ro-woon (15 episodes, 2017)
• 
  Hyuk Choi

  Man in restroom
• 
  Park Ha-Jun

  Eun Hwan Ki (young)
• 
  Yeong-gyu Park

  Actor Hwang
• 
  Jeong-min Heo

  Eom Sun-bong
• 
  Han-wi Lee

  Ro-woon's father

• 
  Stephanie Lee

  Director Park
• 
  Mi-kyung Kim

  Ro-woon's mother
• 
  Hwang So-Hee

  Assistant Manager Lee
• 
  Eunbi Lee

  Bit part