The film is the first South Korean live-action zombie film, and it follows Seok-woo (Sang-ho Yeon) as he struggles to keep himself and his young daughter alive on a train while trying to reach his ex-wife from Seoul to Busan. The film mostly takes place on a train the train to Busan as a zombie apocalypse suddenly breaks out in South Korea and threatens the safety of the passengers. While on the train, Seok-woo meets other survivors with whom he teams up to try and make it out alive.
