A high school student, Young-Sin (So-Dam Park), is run over by a car at night. Soon, she suffers from mysterious ailments. Priest Kim (Kim Yun-seok) meets the young woman on one of her visits to the hospital. He is sure that it was possessed by demonic spirits. Kim is preparing for an exorcism with the help of the Korean Catholic Church. Priest Kim requires a deacon to help him, but all deacons flee after participating in the exorcism. The seminarist Choi is the deacon number 11 who will help the Priest.