Min-ah comes across a diary written by two girls in love. Having read its contents she falls prey to strange hallucinations. Min-ah fakes illness in order to read the diary in peace in the sick room. She accidentally overhears a conversation between Hyo-shin and Shi-eun, the authors of the diary. A few hours later, while the young girls are ail worked up over their forthcoming médical check-ups, a loud cry is heard : Hyo-shin has just thrown herself out of the window. In the following days, by the accident. Strange things start to happen in the school, affecting Min-ah in particular.