A young girl, Young-sin has an accident and is then possessed by an evil spirit after the accident. Pastor Kim, who is the priest at Young-sin's church, believes that Young-sin is possessed by an evil spirit and needs help to perform an exorcism. Pastor Kim chooses a young seminarian named Choi as a deacon to help him in the exorcism process. The two of them then perform an exorcism ritual to free Young-sin from the clutches of the evil spirit. However, they realize that the evil spirit is much stronger and more dangerous than they previously thought. They must fight hard to fight the evil spirit and save Young-sin. In short, The Splendid Priests is a South Korean mystery horror film that combines religious elements with supernatural horror elements.