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.

After 8-year-old So-won narrowly survives a brutal sexual assault, her family labors to help her heal while coping with their own rage and grief.

Ji-so, a young girl who doesn't have a house because of her bankrupted dad. In order to get money to buy a house she plan to steals wealthy people's dogs to earn reward money when she returns them.