In a dystopian Chile, during Pascual's birthday (18), his friends come up with a game: to do a panty hunt in the building where the single women have just arrived. Pascual cheats to avoid hurting a woman and is discovered by the 19-year-old Zángano, who threatens him by telling him that if he doesn't hurt a woman, he will hurt his younger sister Olivia, aged 12.
Chile, 1970. During a night of heavy drinking, Jaime, a lonely 20-year-old young man, is sentenced to prison. There, he meets “The Stallion”, an older and respected man in whom he finds protection, and from whom he learns about love and loyalty. But as their relationship grows stronger, “The Stallion” faces the violent power struggles within the prison.