The Guest

Yoon Hwa-pyung, the young son of a shaman family, is a psychic and can see ghosts. After a villager is possessed, he too is possessed by a powerful spirit called Park Il-do. His mother is then mysteriously killed and his grandmother commits suicide. Priest Yang and young priest-in-training Priest Choi arrive to perform an exorcism. Choi speaks with Hwa-pyung and is subsequently possessed, with the spirit leaving Hwa-pyung's body. Priest Choi returns home and brutally murders his parents as his kid brother, Choi Yoon, hides. At the same time, Hwa-pyung runs away from home after his father tries to strangle him, blaming him for the family's deaths. He stops before Priest Choi's house, sensing an evil spirit inside. A policewoman and her daughter, Kang Gil-young, drive by and see Hwa-pyung; the policewoman investigates and saves Yoon before she is murdered by Priest Choi. Yoon joins the traumatized Gil-young and Hwa-pyung outside before the kids are separated by the police. In 2018, 20 years after the incident, Hwa-pyung is now a taxi driver whose ultimate goal is to find Priest Choi in order to exorcise Park Il-do from his body. With his powers, he is able to see through the eyes of those possessed by Park Il-do and find out who they have killed, which results in his entanglement with Gil-Young, who followed her mother's footsteps and became a police detective. Yoon is now a priest, also determined to find his possessed brother. Unbeknownst to the three, they are the children from the incident, though they do not recognize each other now all these years later. As Hwa-pyung and Yoon reluctantly work together to expel demons, Gil-young works to bring justice to the victims, being skeptical of spirits.