Intro. In Youth, Park Yeon-Jin and his group were monsters disguised as teenagers. Their cruelty marked the skin, body and soul of Moon Dong-eun-each scar a reminder that her life had been stolen. Years later, revenge finally began to devour Park Yeon-jin, consuming his life and secrets.
But in the middle of the fall, one detail arises: Moon Dong-Eun has a daughter. Young, innocent, the living reflection of the woman he vowed to destroy. He goes to her to kill, to extinguish the last remnant of Dong-eun once and for all.
Only, before the girl, something changes. It is not pity. It's worse. It is obsession.
The girl becomes his new prison - an object of distorted desire, a shadow that he cannot unleash. The hatred for the mother mixes with the unhealthy fascination of the daughter, creating a web where death, pleasure and revenge are confused until there is no longer leaving.