The story of a psychic, a priest, and a detective who fight unusual crimes committed by strange powers.
As a child, Yoon Hwa-pyeong witnesses the violence of a spirit that possesses humans. Years later, a psychic vision leads him to a reservoir.
Choi Yun and his partner's exorcism of a possessed man ends in tragedy. Hwa-pyeong convinces Kang Gil-yeong that the man's daughter is still alive.
Hwa-pyeong gets a vision of a kidnapped woman in a car trunk. He asks Gil-yeong to check missing persons reports while he looks for the culprit.
A surprise awaits Gil-yeong as she visits the daughter of the missing woman. At a junkyard, Hwa-pyeong and Yun confront the demon.
A human skeleton is found in the countryside. Yun, Hwa-pyeong and Gil-yeong each head there and realize how their pasts connect them together.
The possessed woman disappears from the hospital. Seeing in a vision that she's headed to her boyfriend's workplace, Hwa-pyeong tells Gil-yeong.
Gil-yeong dives into her late mother's last case, involving an assemblywoman named Park Hong-ju and the body of a missing student.
Yun gets the charges against Hwa-pyeong dropped. After hearing about a child who may be just like him, Hwa-pyeong stumbles into a gruesome incident.
Yun, Hwa-pyeong and Gil-yeong must stop Jung Seo-yun. When Yun gets trapped in a basement with her, he's forced to face his personal demons.
Wanting answers about the dead priest, Hwa-pyeong tracks down his long-lost father. Gil-yeong and Yun ask around about Park Il-do's origins.
Hwa-pyeong becomes the wrongful suspect in a homicide. But he's more concerned about preventing his possessed father from doing more damage.
While troubling symptoms begin to plague Hwa-pyeong, Yun is urged not to trust him. Gil-yeong opens up to her partner about what she's been up to.
Yun and Hwa-pyeong arrive to save Gil-yeong in the nick of time. Yun suffers the consequences of performing another exorcism.
Yun causes a scene during Mass. Hwa-pyeong searches for Yukgwang. Gil-yeong meets a nun who's determined to bring down Hong-ju.
Hwa-pyeong's grandfather is abducted. As Hwa-pyeong, Yun and Gil-yeong set out to locate him, they're made to follow a series of horrific clues.
Hwa-pyeong and Yun are each prepared to make necessary sacrifices. But they soon realize nothing about Park Il-do is as it seems.
