Eun-hee is hired as a vice principal at her old high school, where unusual things take place in the closed down restroom. High school pupil Ha-young and also So-yeon, who used the restroom as their hideout listen to humming in the vacant bathroom, and think that a ghost exists inside. Ha-young uncovers a flowerpot on the stairways and think that Eun-hee is in some way connected to the mystery. Dealing with hallucination upon her commencement, Eun-hee discovers an awful figured girl in the washroom mirror and also starts to think that the girl was the one that brought her back to this school ...