Forget what you think you know about high school nightmares – Seon Jin’s world is a living hell, and the monster sleeps in the room next door. All he ever wanted was to disappear, to simply survive another day as the quiet, broken boy everyone overlooks, a shadow haunted by his own physical frailties. But when you share a house with a charismatic, respected man who secretly hunts and murders the innocent, invisibility is a curse, not a shield.

Seon Jin isn't just an eyewitness to terror; he's an unwilling accomplice, forced into a grotesque dance with his charming, sociopathic father. Every step, every choice, is a twisted game of survival. But then *she* arrives—a new transfer student who sees past Jin's scars and into his soul, a girl who, for the first time, makes him want to fight back. Now, the stakes are impossibly high: can a boy who's been a prisoner in his own home find the courage to defy the one person he’s programmed to obey? Or will the monster who raised him claim yet another victim, breaking Seon Jin’s spirit, and his heart, beyond repair? Prepare for a heart-pounding plunge into a darkness so profound, you’ll question who the real monster is.

Psychological thriller, serial killer, high school drama, survival, moral dilemma, forbidden love, coming of age, horror, mystery, family secrets