Lin Jiu, an apprentice at the old street boxing gym, takes the hardest beatings and develops the hardest bones. Twelve years after his father disappeared, a debt collection note and the sentence "Your father owed me back then" pushed him into the underground world of Binjiang. From the night market stall to the pier, from the horse stall to the restaurant, there were people who tried to suppress him along the way, but they all became stepping stones for him to reach the top. The "iron bones" are unbreakable, a punch opens the way, the Nine Dragons return to their throne, and the bloodline becomes king.
