The drama is about exorcism and tells the story of the pursuit between wizards, priests and detectives who use strange powers to fight against criminal forces. Kim Jae-wook will play Choi Yun, a priest who assists the necromancer. He does not have many emotions, always behaves indifferently, and has a calm personality like water. He is a "seemingly inhumane" character. Kim Dong-wook will play Yoon Hwa-pyeong, a psychic who can see evil spirits. He lost his mother and grandmother after being possessed by evil spirits. He can feel special abilities that ordinary people cannot feel, and he will be the one with the strongest supernatural abilities among the three protagonists. Jung Chae-eun will play the detective Kang Ji-young who does not believe in evil spirits. At first, she did not believe in the existence of evil spirits and exorcism, but after chasing a series of criminals with Yoon Hwa-pyeong and Choi Yun, she gradually felt their existence and began to face the truth of what happened to her in the past. '