Seok-woo, a father with not much time for his daughter, and Soo-an, his daughter, 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 becomes 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.