Yoon Hyun-min

Ko Nan-do / Holo

Ko Sung-hee

Han So-yeon

Choi Yeo-jin

Ko Yoo-jin

Hwang Chan-sung

Baek Chan-sung

Lee Jung-eun

So-yeon's mother

Kang Seung-hyun

Yoo Ram

Son Jong-hak

Nam Gi-Ho

Jung Young-ki

Jo Jin-Seok

Jeong Yeon-joo

Ji Na

Nam Myung-ryeol

Baek Nam-Gyu

Jeong Do-won

Mr. Jeong

Lee You-mi

Ji Hye

Yang Dae-hyeok

Lee Dong Sik

Gong Min-jeung

Jeong Ah

Park Geon-gyu

GIO Labs staff

Lee Ki-chan

Lee Ki Chan Yeon Kang Woo [So Yeon's boss]

Kim Soo-jin

Mère de Nan-Do

Baek Jin-hee

Voice

Lee Sang-yeob

Director

Jinnie Choi

Executive Producer

Ryu Yong-jae

Writer