Lu Chen, a national-level agent, was betrayed by his colleagues and died at the hands of the person he trusted most. When he opened his eyes again, he became the substitute for the good-for-nothing son-in-law who was despised by everyone in the city. He was in debt, broke off the engagement, and was humiliated by blocking the door. At the beginning, he was pushed into the underground boxing gym and used as a scapegoat. But his killing skills in his previous life were still there, and he would kill on the spot as soon as he took action. What's even more outrageous is that after signing in at the blood pool, he actually received the god-level inheritance "Nine Heavens Killing God Technique". Within three chapters, the spiritual root awakens, the martial soul awakens, and the trash turns into a martial arts monster. Black boxing arenas, underground auctions, martial arts conferences, and alien invasions are all Shura venues. While others fight for family background, backstage, and resources, he relies on the system, killings, and defeating powerful enemies along the way, and draws the princess, the reincarnation of the empress, and the system elves into the game. The spokesperson of Heaven wants to use him as a pawn? The demon giant wants to harvest the energy and blood of the whole city? Then ask him about the knife in his hand first and see if he answers.