Former ten-time boxing champion Pei Feng gets out of prison and goes incognito, surviving as a cleaner at a boxing gym. When Wu Ya and his thugs storm the gym to pick a fight, Pei Feng recognizes his enemy's scorpion tattoo and is forced to step in to protect the club. To uncover the truth behind his father's murder, he barges into underground black-market boxing, fights his way into the DOC national tournament, crushes powerful foes all the way, tears apart the Scorpion Group's dark conspiracies of rigged betting, murder, and capital listing, and ultimately clears his father's name with his iron fists.