Born mentally retarded Karl (Billy Bob Thornton Billy Bob Thornton) was born in an unfortunate family: superstitious parents always regard him as God's punishment for them, so they hate him very much and always beat him. Carl, who has been living in the shadow since childhood, the 8-year-old ran into his mother having an affair with a pimp, and his repressed emotions broke out instantly, and he stabbed them both to death with a spring knife. Carl spent the next 25 years in a mental hospital. On the day he was released from the hospital, the homeless Carl was taken in by the administrator of the mental hospital for one night. It was the first time he felt the warmth of the world. After being discharged from the hospital, people want to avoid Carl like a plague until he meets his good friend Frank (Lucas Blake Lucas Black). Frank regarded him as his best friend, and Carl saw the sunshine in his life. Recently, however, the Frank family has been disturbed by his mother's alcoholic boyfriend. Carl, who couldn't stand it when he saw his friend suffering, decided to come forward.