Diary (Mon seung) (2006)

The dour and volatile Winnie likes to make wooden puppets and write in her diary. After her boyfriend Seth leaves her, Winnie becomes increasingly emotionally and psychologically unstable.
At the urging of her friend, she starts a new relationship with Seth-lookalike Ray, but the relationship soon makes the same downward spiral as before.
As the situation worsens, so too does her grasp of reality.

Part 1
Part 2
Part 3