What If I'm One Hell of A Fighter

After his father dies, Kane is taken in by Eve, a gym owner. Bullied as a janitor, he hides his skills until gangsters threaten the gym. Kane defeats them but is forced into an underground death match against the world champion—and wins, securing millions. Eve's kidnapped father is already dead. Kane avenges him. Months later, the gym thrives. Kane and Eve find family and purpose together.