| Director | Choi Ik-hwan |
|---|---|
| Genre | drama film, horror film |
| Runtime | 105 min |
| Country | South Korea |
| Box office | $2.9 million |
Young-eon (Kim Ok-vin), the top singer at an all-girls school, is murdered by a music sheet cutting her throat in the opening scene. The next day her ghost returns, but nobody can see or hear her spirit except her friend Seon-min (Seo Ji-hye), who can only hear her. The two attempt to find out what happened to Young-eon, as her memory is fractured. Seon-min speculates that the music teacher must have killed Young-eon. Young-eon begins to have flashbacks about her past and the time when she was murdered.
Seon-min befriends a strange and lonely girl at school named Cho-ah (Cha Ye-ryun), who can hear the voices of the dead. Cho-ah decides to help the two. Meanwhile, the music teacher kills herself. Seon-min begins to doubt what Young-eon says about her past after Cho-ah tells her that ghosts only remember what they want to, meaning Young-eon's memory may be unreliable. Young-eon's body is found on top of the elevator.
Young-eon learns that if Seon-min forgets about her, nobody will be able to hear her, and she begins to have increasingly disturbing and bizarre flashbacks about her mother's suicide, which Young-eon carelessly encouraged her to go through with while lacking understanding of the consequences of her actions. She meets Hyo-jung, another ghost who she has conflicting memories about. It is revealed that Young-eon previously had a rivalry with Hyo-jung due to their similar voices, and that she began wishing their teacher was dead in order to cause Hyo-jung, who was in love with their teacher, to quit music. In an intense confrontation, Young-eon and Hyo-jung killed each other.
Seon-min, after learning this, thinks Young-eon should move on and be at peace but Young-eon is angered by her statement, since she wants nothing more than to live again. Young-eon flies into a rage, killing Cho-ah and taking over Seon-min's body. She then walks alongside Seon-min's mother, talking about how, as soon as she is old enough, she will learn to drive, replicating a conversation Young-eun had with her mother before her mother committed suicide.
A scene during the credits shows Cho-ah shouting in frustration, but as she is voiceless, no sound comes out.