Hyun-su and Soo-jin are newlyweds. Seemingly out of nowhere, he starts talking in his sleep. “Someone’s inside.” From that night on, whenever he falls asleep, he transforms into someone else…

Kim Ji-young, an ordinary woman in her 30s, suddenly shows signs of being inhabited by other women from her life, past and present.

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.

When a zombie virus pushes Korea into a state of emergency, those trapped on an express train to Busan must fight for their own survival.