The Guest
Crimes caused by mysterious powers take place. A psychic, a Catholic priest and a detective fight against these crimes.
Yoon Hwa-Pyung (Kim Dong-Wook) is the psychic. He was born to a shaman family. Yoon Hwa-Pyung seeks out those possessed by evil spirits and attempts to expel the evil spirits.
Choi Yoon (Kim Jae-Wook) is the Catholic priest. He is cynical and cool-headed. He doesn't like having relationships with others. He is recognized for his abilities as an exorcist.
Kang Kil-Young (Jung Eun-Chae) is the detective. She doesn't believe in evil spirts or exorcisms, but her views change because of Choi Yoon and Yoon Hwa-Pyung.
The Ghost Detective
Lee Da-Il is a private investigator. He was formerly in the military, but a whistleblower case led to his discharge. Jung Yeo-Wool becomes his assistant. She is a fearless woman. They work together to solve a mystery surrounding the death of a younger sibling. They also work together to solve other cases, some involving ghosts.
Crimes caused by mysterious powers take place. A psychic, a Catholic priest and a detective fight against these crimes.
Yoon Hwa-Pyung (Kim Dong-Wook) is the psychic. He was born to a shaman family. Yoon Hwa-Pyung seeks out those possessed by evil spirits and attempts to expel the evil spirits.
Choi Yoon (Kim Jae-Wook) is the Catholic priest. He is cynical and cool-headed. He doesn't like having relationships with others. He is recognized for his abilities as an exorcist.
Kang Kil-Young (Jung Eun-Chae) is the detective. She doesn't believe in evil spirts or exorcisms, but her views change because of Choi Yoon and Yoon Hwa-Pyung.
The Ghost Detective
Lee Da-Il is a private investigator. He was formerly in the military, but a whistleblower case led to his discharge. Jung Yeo-Wool becomes his assistant. She is a fearless woman. They work together to solve a mystery surrounding the death of a younger sibling. They also work together to solve other cases, some involving ghosts.