Y公交车上一位小伙子上车没有找到座位，就往后一直走oo-ra suffers from nightmares every night. One day she meets her high school friends. Jin-tae is a promising artist, In-seok is a chaebol and former thug, Hye-jin likes In-seok, and Seong-ho, who used to be In-seoks errand boy, finally meet up. Yoo-ra asks her friends if they remember the classmate that killed herself. Everyone is flustered and claims they dont. 　　Yoo-ra goes to the bathroom, but passes out after seeing herself in the mirror. Everyone gets in In-seoks car to send Yoo-ra home, but they get into an accident and all become unconscious. When they wake up, they are at a familiar school thats closed. It was the school they went to that has closed down. 　　Why did they end up there? Yoo-ra and her friends tremble in fear for their lives...