Cast Members (18)
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Yoon Hyun-min
as Ko Nan-do / Holo
12 episodes
Ko Sung-hee
as Han So-yeon
12 episodes
Choi Yeo-jin
as Ko Yoo-jin
12 episodes
Hwang Chan-seong
as Baek Chan-sung
12 episodes
Lee Jung-eun
as So-yeon's mother
12 episodes
Kang Seung-hyun
as Yoo Ram
12 episodes
Son Jong-hak
as Nam Gi-Ho
12 episodes
Jung Young-ki
as Jo Jin-Seok
12 episodes
Jeong Yeon-joo
as Ji Na
12 episodes
Nam Myung-ryeol
as Baek Nam-Gyu
12 episodes
Jeong Do-won
as Mr. Jeong
12 episodes
Lee You-mi
as Ji Hye
12 episodes
Yang Dae-hyeok
as Lee Dong Sik
12 episodes
Gong Min-jeung
as Jeong Ah
12 episodes
Park Geon-gyu
as GIO Labs staff
12 episodes
Kim Soo-jin
as Mère de Nan-Do
1 episode
Lee Ki-chan
as Lee Ki Chan Yeon Kang Woo [So Yeon's boss]
4 episodes
Baek Jin-hee
as Voice
1 episode