Delivery driver Kang Han-gil has spent every waking moment trying to save his father, who has turned into a zombie. Poverty and exhaustion weigh on him, but he refuses to give up. Then someone from his past reappears, Shin Midum, a man Han-gil hoped never to see again. Calling himself a "zombie caretaker," Midum claims he can cure Han-gil's father with a new experimental drug. But there is a price, and his demand is unsettlingly simple, he wants Han-gil in his bed. Before Han-gil can decide whether to accept, disaster strikes. His zombified father escapes, the apartment complex collapses into chaos, and the entire building becomes a nest of the undead. Trapped together, Han-gil and Midum have no choice but to rely on each other. (Source: Lezhin Entertainment)