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.

A convict returns to his home town to torturing again his family and face his neighbors trying to destroy the local religious fanatics and their plans to keep money from the village people.

An ordinary guy suddenly finds he has superpowers he can use to help his spirited daughter and the people around them, but he also runs into trouble in the process.

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…

Suk-gyu is desperately looking for his runaway daughter. He spares neither money nor effort and after a while his search leads to results. One of his contacts claims to have found the girl. But joy is replaced by shock when he finds out that she works as a prostitute in the center of Seoul. Suk-gyu decides to pose as a client to get close to his daughter. But just before the long awaited and dreaded reunion, panic breaks out at nearby Seoul Station. The place is very popular with the homeless of the Korean capital. And one of them, who had died during the day, comes alive again and start attacking and eating another misfortunate. The undead cannibal epidemic spreads like wildfire. The authorities hermetically close off the city center and decide to wait out the end of the outbreak, until there’s no one left…