Pastor Park is head of a religious investigation center that exposes cults and cult leaders. While looking into a suspicious new religion called Deer Mount, he slowly uncovers clues that connect this cult to a series of mysterious cases of missing teenage girls when a body is found inside a damaged tunnel beams. He begins to uncover dark secrets surrounding this cult and its enforcer Na-han.

On one hot summer day in a cafe by a university, three high school girls get together. They talk about coffee, smoking and love, but none of them are truthful.