Many people want to deny reality. Baekhyun wants to do so now.

Baekhyun wakes up in his own apartment to realize the door is locked in chains. But he finds a mysterious hole in his bathroom that connects to other worlds. Nobody is there to help him. Nobody can hear him outside. Nobody is able to get him out of this nightmare.

But when Baekhyun gets to meet his next door neighbor, Eunji, at one of the parallel worlds. They both embark on a strange journey, uncovering the strange and disturbing history of their apartment building- and also the stories of those who had once lived in Room 302.