The tormented spirit of a dead singer haunts the same school where she met her mysterious end, and the only person who can hear her cries of vengeance is her devoted best friend. Park Young-Eon was a promising singer who simply disappeared one night while practicing at school. Though her body was never found, her voice still echoes through the hallways of the school. But only Young-Eon's best friend Kang Sun-min can hear her disembodied calls. Now, as Sun-min discovers the disturbing truth about the death of Young-eon, she realizes that her friend's killer is still stalking the school campus.