Voice (2005)
Original title: 여고괴담 4: 목소리
Voice is a 2005 Korean-language horror movie directed by Choi Equan, with a running time of 1h 44m. It stars Kim Ok-vin, Seo Ji-hye and Cha Ye-ryun.
While practicing after hours in her high school, an aspiring singer is mysteriously killed and her body vanishes. Her invisible ghost is trapped in the school, but her best friend is able to hear her voice.