Cheong San was convinced that he had died. He felt the flames, he felt the crash, and then he felt nothing. So it doesn't make sense that he wakes up to a peaceful time before the apocalypse started. Cheong San, not sure what is going on, resolves to do things differently this time in order to save everyone he loves. However, what he didn't count on was falling in love with someone different this time around.

Jong Woo moves into what appears to be a run down residence but nothing more than that. However, during his stay at this residence he encounters Moon Jo, a reserved dentist. When things start going sour between the people in the residence, and people are dropping like flies, going missing out of nowhere he can't help question whether the culprit is in between these walls.