This is a broken family. The alcoholic coach father Paddy (Nick Nolte) abuses his wife. The second son Tommy (Tom Hardy) and his unbearable mother go to another country. The eldest son Brandon (Joel Edgerton) chooses to stay for love, and thinks that he can get his father's respect and cultivation from then on, but in the end, the father and son part ways. After many years, Tommy found his father with the sad memory of his mother's painful death and the painful experience in the Iraq War, asking the latter to serve as his coach again to participate in the MMA big prize competition; almost at the same time, Brandon, a former professional fighter and now a high school physics teacher, was troubled by money. He couldn't stand that he couldn't provide shelter for his wife and daughter, so he decided to return to the arena. In the MMA arena, the brothers who have been separated for many years will meet again, and use the fusion of blood and sweat to resolve each other's knots...