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Eun Hwan-Ki
16 episodes
Chae Ro-Woon
Kang Woo-Il
Eun Yi-Soo
Dang Yoo-Hee
Eom Sun-Bong
Reporter Woo
Kim Gyo-Ri
Director Park
Hwan-Ki's father
Hwan-Ki's mother
Ro-Woon's father
Jang Se-Jong
Ro-Woon's mother
Deputy Jung
Deputy Lee
Chae Ji-hye
Seo Yeon-jung
Brain Security
2 episodes
Orphanage director
Himself
1 episode
Advertiser
Investor in Brain
Man at the men's restroom
Young Gyu's transgender daughter
Hwang Yeong-Kyu
Yeong Kyu's manager
Restaurant management
Master Jin
