A stylish supernatural romance from Korea, MEMENTO MORI explores the relationship between a trio of high school students, Min-ah and two friends. However, their friendship changes when Min-ah begins reading her friend`s diary and finds that it contains some bizarre secrets. Soon after, her friend commits suicide, leaving Min-ah feeling guilty. However, when Min-ah begins to realize that the dead girl has come back to possess her, the relationship between the three classmates takes a surprising turn.