Kang Soo-youn

Seo-hyun

Kim Hyun-joo

Jung-yi

Ryu Kyung-soo

Sang-hoon

Uhm Ji-won

Se-yeon

Lee Dong-hee

Chairman

Han Woo-yeol

Jae-kyung

Yun Ki-chang

Researcher 1

Lee Ga-kyung

Researcher 2

Shin Min-jae

Researcher 3

Kim Sun-hyuk

Researcher 5 / Voice over the Radio (voice)

Lee Hyun-kyun

Doctor

Park So-i

Young Seo-hyun

Na Ho-sook

Seo-hyun's grandmother

Ki Hwan

Suit Man 1

Lee Seung-chan

Suit Man 2

Kim Tae-jun

Buffet

Do Yong-gu

General 1

Hong Seok-bin

General 2

Jeon Jung-il

Suit General 1

Son Young-soon

Old Jung-yi

Cha Young-ju

Nurse

Cha Hee

Woman in Suit

Park So-eul

Monorail Kid

Yoon Hyun-gil

Monorail mom

Shin Chi-young

Worker