Hyun Soo, a loner high school student who lost his entire family in a terrible accident, moves to an old apartment complex called Green Home. Driven by despair, he gradually realizes the secret of the Green home. The fact that a monster trying to drive humanity out of various forms of distorted human desires surrounds the Green home, including himself, and that the residents of Green Homes are trapped in them. Adapted from a webtoon of the same name by Kim Kan Bi and Hwang Young Chan.