"This school is dangerous."

It is a land which is uninhabitable. It is a land where the dead cannot exit, and it is a land where they gather. There, an independent high school is built.

It is a place where the living and the dead intermingle, and it is where Eunbi, who is given the fate of a psychic, is admitted into.

"Don't be scared. No matter what happens, I'll definitely send you home, somehow."

Eunbi listens to the stories of the dead and solves cases whilst wandering on the path of ghosts hidden in the school with Seonwoo, who she met by chance before entering the school.

It's too late when Jamin High School's secret is revealed...

"Ah, I forgot to tell you. This is a two-story building. If you ever see a staircase leading to the third floor, don't ever go up."

“-이 학교는 위험해.”

사람이 살 수 없는 곳.
망자가 나가지 못하고 고여 버리는 땅.

그곳에 자민 자립형 사립 고등학교가 들어선다.

생자와 망자가 뒤섞인 곳,
그곳에 영매의 운명이 주어진 은비가 입학하게 된다.

“무서워하지 마. 무슨 일이 있어도 반드시 너만은, 너만은 어떻게든 집으로 돌려보낼게.”

은비는 입학 전 우연히 만나 도움을 얻었던 선우와 함께
자민고의 비밀은 뒤늦게 모습을 파해치기 시작하는데….

“있잖아. 혹시 3층으로 올라가는 계단이 생겨도, 거기론 절대 올라가지 마.”