Voice is a 2005 South Korean horror film directed by Choi Ik-hwan and starring Kim Ok-bin and Seo Ji-hye. The movie revolves around the ghost of a high school student named Park Young-Eon, who is mysteriously killed while training after hours.
Her body vanishes, and she becomes trapped in her school as an invisible ghost. However, her best friend Kang Sun-min, a school radio broadcaster, can hear her voice. Together, they uncover the truth surrounding the school's dark past and the deaths of several students, including Hyo-Jung, who died in the same elevator trunk that claimed Young-Eon's life.
As the mystery unravels, Young-Eon's ghost reveals the shocking circumstances surrounding her death, including her troubled past, abusive mother, and struggles with depression. In a chilling climax, the true identity of the killer is revealed, and the haunting story of Voice reaches its conclusion.
The film is known for its use of sound design to create an eerie atmosphere, incorporating various sound effects and musical cues to heighten the tension. It received critical acclaim in South Korea upon its release and has since gained a cult following among horror fans worldwide.