Gong Yoo as Seok-woo

Kim Su-an as Soo-ahn

Jung Yu-mi as Sung-gyeong

Don Lee 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)

Lee Tae-yoon as Survivor (as Tae-Yoon Lee)

Kim Tae-yun as Student