Four years after the outbreak of a terrible virus that South Korea was unable to contain, what's left of the country is under siege, and hordes of zombies roam the peninsula. Han Jong-seok, an ex-military man who once managed to evacuate, is sent from Hong Kong to the closed zone as part of a small team to find a truckload of money. He has to make his way through a spooky world where, besides the threat, there are also people who play cruel games of survival.