Yoon Hyun-min

Ko Nan-do / Holo

윤현민

Ko Sung-hee

Han So-yeon

고성희

Choi Yeo-jin

Ko Yoo-jin

최여진

Hwang Chan-seong

Baek Chan-sung

황찬성

Lee Jung-eun

So-yeon's mother

이정은

Kang Seung-hyun

Yoo Ram

강승현

Son Jong-hak

Nam Gi-Ho

손종학

Jung Young-ki

Jo Jin-Seok

정영기

Jeong Yeon-joo

Ji Na

정연주

남명렬

Baek Nam-Gyu

정도원

Mr. Jeong

Yoomee Lee

Ji Hye

이유미

양대혁

Lee Dong Sik

Gong Min-jeung

Jeong Ah

공민정

박건규

GIO Labs staff

Kim Su-jin

Mère de Nan-Do

김수진

이기찬

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

백진희

Voice