Martial law is declared when a mysterious viral outbreak pushes Korea into a state of emergency. Those on an express train to Busan, a city that has successfully fended off the viral outbreak, must fight for their own survival…

Peninsula takes place four years after Train to Busan as the characters fight to escape the land that is in ruins due to an unprecedented disaster.

By chance, a man and a woman meet on the KTX train and spend 24 hours in the unfamiliar city of Busan, South Korea.