Ki-chul (Ma Dong-seok) is assigned to a rural high school as a physical education teacher and also serves as the dean of discipline. However, as soon as Ki-chul arrives at the school, he immediately feels that something is fishy. Not only does the school staff exude a strange atmosphere, but the town residents also seem to be hiding some unspeakable secrets. One day, a female student disappeared, but everyone remained silent, as if nothing had happened. Only the female student's friend Yoo-jeong (Kim Sae-ron) firmly believed that her friend had been kidnapped and did not give up the investigation. The evidence of the female student's disappearance is being erased bit by bit. How can Ki-chul and Yoo-jeong, a teacher and student, find out the horrifying truth behind the incident and rescue the missing female student?