In 'The Priests', a series of strange events takes place in a hospital, involving a comatose patient and demonic possessions. Two priests, Father Kim and Father Goo, team up to solve the case and rid the hospital of the evil spirits. As they delve deeper into the mystery, they uncover a dark secret that threatens their lives and faith.

Desperation drives two nuns to perform an exorcism no nun should attempt. With a possessed child at the mercy of evil and the opposition of the Catholic Church, they take on the dangerous forbidden rituals themselves, putting their immortal souls in grave danger. They must confront the terrifying cost of their sacrilegious actions, but one goal remains: the boy must be saved at all costs.