A world full of despair and a boy with no regrets, throw off the reality and panic and face it head-on! Lonely high school student Cha Hyun-soo (Song Kang) moves to a new apartment after his family dies in an accident. His peaceful life is soon disturbed by strange events that begin to occur in his new residence. When people turn into monsters, Hyun-soo and other residents begin to struggle for survival. The story is adapted from the comic of the same name co-created by Kim Kan-bi and Hwang Young-chan and serialized on Webtoon.