Eun Hwan-ki (16 episodes, 2017)
Eun Yi-soo (16 episodes, 2017)
Kang Woo-il (16 episodes, 2017)
Dang Yoo-hee (15 episodes, 2017)
Chae Ro-woon (15 episodes, 2017)
Kim Gyo-ri (15 episodes, 2017)
Hwan-ki's father (14 episodes, 2017)
Hwan-ki's mother (9 episodes, 2017)
Seo Yeon-jung (8 episodes, 2017)
Chae Ji-hye (8 episodes, 2017)
Assistant Manager Lee (7 episodes, 2017)
Bit part (1 episode, 2017)
Actor Hwang (1 episode, 2017)
Investor in Brain (1 episode, 2017)
Eun Hwan Ki (young) (1 episode, 2017)
Man in restroom (1 episode, 2017)
Ro-woon's mother (unknown episodes)
Director Park (unknown episodes)
Eom Sun-bong (unknown episodes)
Ro-woon's father (unknown episodes)