Gong Yoo
as Seok-woo

Kim Su-an
as Soo-ahn

Jung Yu-mi
as Sung-gyeong

Ma Dong-seok
as Sang-hwa

Choi Woo-shik
as Yeong-gook

An So-hee
as Jin-hee

Kim Eui-sung
as Yong-suk

Ye Su-jeong
as In-gil

Park Myung-shin
as Jong-gil

Choi Gwi-hwa
as Homeless Man

Jeong Seok-yong
as Captain of KTX

Kim Chang-hwan
as Kim Jin-mo

Jang Hyuk-jin
as Ki-chul

Shim Eun-kyung
as Stowaway

Lee Joo-sil
as Seok-woo's Mother

Kim Jae-rok
as Mr. Kim

Cha Chung-hwa
as Mountaineering Woman

Kim Won-jin
as Embarrassing Youth

Han Ji-eun
as Earphones Girl

Han Sung-soo
as Train Attendant

Lee Jung-ok
as Suit

Kim Ju-hun
as Baseball Team Manager

Kim Keum-soon
as Survivor

Chyu Kwang-hyun
as Infected

Jung Young-ki
as Captain Min (voice)

Ok Joo-ri
as Survivor

Woo Do-im
as Cabin Attendant Min-ji

Song Ji-hyuk
as Baseball Team

Kim Woon
as Infected (uncredited)

Jeon Ye-eun
as Infected (uncredited)

Baek Seung-hwan
as Survivor (uncredited)

Yeon Sang-ho
as Control Room (uncredited)

Choi Woo-sung
as Infected (uncredited)