In the small village Goksung in South Korea, police officer Jong-Goo investigates bizarre murders caused by a mysterious disease. His partner relays gossip that a Japanese stranger, who lives in a secluded house in the mountains, would be an evil spirit responsible for the illness. Jong-Goo decides to visit the stranger along with his partner and a young priest who speaks Japanese. They find an altar with a goat head, pictures on the walls of the infected people that died, and an attacking guard dog that prevents their departure until the stranger arrives. Jong-Goo finds one shoe of his beloved daughter, Hyo-jin, in the house of the stranger, and soon she becomes sick. His mother-in-law summons the shaman Il-gwang to save her granddaughter while a mysterious woman tells Jong-Goo that the stranger is responsible. Who might be the demon that is bringing sickness to Goksung?

Sok-woo, a father with not much time for his daughter, Soo-ahn, are boarding the KTX, a fast train that shall bring them from Seoul to Busan. But during their journey, the apocalypse begins, and most of the earth's population become flesh craving zombies. While the KTX is shooting towards Busan, the passenger's fight for their families and lives against the zombies - and each other.

I Am John The Baptist For This Shit