While training after hours in her high school, the singer Park Young-Eon is strangely killed and her body vanishes. Her ghost is imperceptible and trapped at the faculty, but her friend Kang Sun-min, that broadcast at the lunchtime in school, is able to hear her voice. After the suicide of these music educator, Sun-min finds that another student, Hyo-Jung, died at precisely exactly the same elevator trunk. Meanwhile Young-Eon recalls details of her entire life, she expired, disclosing.