Former UFC player Lin Mu had his career ruined after he was falsely accused of doping. He was forced to join the underground black boxing industry after he owed huge debts. When he discovers that this is not just a boxing match, but a huge criminal empire gambling with life, and his sister is kidnapped and held hostage, he has no choice but to fight the entire system with his flesh and blood in a cage, ultimately destroying the empire but paying the price of freedom.
