The world is divided into two parts: 'The Building city' where the rich live, and the 'Hachon' where the poor live. Living in the 'Building city' with her family, Yuji dreams of moving to 'Hachon' one day. If she goes there, she might meet Seojin, who suddenly disappeared. Yuji's parents can't accept a reduction in wealth and are obsessed with their present lives. Yuji's siblings are also troublesome. Yuji's empty daily routine is shattered one day when a huge tornado hits both the city and the countryside.

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.