Yoon Bum grapples with mental instability and profound loneliness, resorting to unhealthy ways of coping. His obsession about his attractive classmate, Oh Sangwoo, is deep-seated and drives his penchant for stalking. When he sneaks into Sangwoo's abode, he bears witness to a macabre sight - an apprehended young woman, gagged, bound, and petrified in a torture chamber.
Caught in the act, Bum's doom is effectively sealed. With a twisted gleam in his eye, Sangwoo ensnares Bum and subjects him to become his latest possession and plaything. Bum is forced to endure a horrific realm of physical mutilation, emotional dependence and manipulation that masquerades as affection - a bleak and dismal life where mental agony cripples him. The fate of the imprisoned woman is no less distressing, with no hope of escape.