This film is about the story of a girl named Young Eon, who dies while performing a song in the music room of her high school. Shortly after her death, Eon's best friend, Sun Min, can still hear her voice echo inside her mind. Later on, Sun Min discovers that she gains a supernatural ability where she can hear her friend's voice from the grave. She uses this ability to try to find out the truth behind Young Eon's death. Unfortunately, Sun Min begins to notice several other students mysteriously dying around campus. She begins to wonder if this incident is a coincidence, or if Young Eon's spirit is causing this bizarre string of murders.