Whispering Corridors 2 (Memento Mori)

In a Korean high-school, the teenagers Hyo-Shin Min and Shi-Eun Yoo are lesbian lovers that decide to write a diary together and expose their love to their schoolmates. When Hyo-Shin has one night stand and gets pregnant of a depressed teacher, the love of Shi-Eun dies and she breaks up with Hyo-Shin leading her to commit suicide. Shi-Eun's classmate Min-Ah So finds and reads their diary, disclosing the innermost secrets of the two lovers, and becomes obsessed for Shi-Eun. When a close friend advises that Min-Ah would die because she was reading the diary of a dead girl, she wants to return the diary to Hyo-Shin.