The Unrighteous

Joo-hyeon (Lee Hyun-Woo) lives in an old, small apartment building called Wonjeong Villa. He takes care of his sick mother and his nephew, while working as a security guard for a bank and at the same time, he studies to become a real estate agent. Shin-hye (Moon Jeong-Hee) lives upstairs from him and comes off as rude and selfish to Joo-hyeon. One day, Joo-hyeon takes a small act of revenge on Shin-Hye by placing a flyer for a sketchy, pseudo church, into her mailbox. Unexpectedly, the flyer leads Shin-Hye to go the church for her sick son, becomes a member and gets obsessed with the church. The residents of Wonjeong Villa, including Joo-hyeon's family, soon fall into danger.