Eun-hee is hired as a vice principal at her old secondary school, where unusual things occur in the shut down bathroom. Secondary school student Ha-young and also So-yeon, who used the restroom as their hideout listen to humming in the empty restroom, as well as think that a ghost exists within. Ha-young finds a flowerpot on the staircases and also suspect that Eun-hee is in some way connected to the secret. Experiencing hallucination upon her launch, Eun-hee finds a dreadful figured woman in the washroom mirror and also begins to believe that the girl was the one that brought her back to this college ...