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.
Voice, also known as Whispering Corridors 4: Voice and Voice Letter, is a 2005 South Korean horror film, and the fourth installment of the Whispering Corridors film series. The film was the debut film for its three young actresses, as well as director Choi Ik-Hwan, who had served as an assistant director on the first film of the series.