The Unrighteous plot
Joo-hyun, a security guard in a bank, lives in an old and small apartment building where he takes care of his sick mother and nephew. At the same time, he is studying for an exam to become a real estate agent. He has a gentle personality and gets along well with most of his neighbors, except for Shin-hye. She lives above him and behaves rudely and selfishly. One day, Joo-hyun takes a small revenge on Shin-hye by putting a flyer of a dodgy pseudo-church in her mailbox. Because of her sick son, Shin-hye becomes a member and becomes obsessed with the church. Joo-hyun and the other residents of the apartment are put in danger by this.