Lin Feng, a community security guard in a bustling city, accidentally awakened the ancient martial arts inheritance in his ancestral jade pendant when he subdued a knife-wielding gangster with his bare hands. The inheritance contains the "Hunyuan Boxing Sutra" chart, which not only has exquisite moves, but also can temper his body and improve his strength in actual combat, allowing him to start the path of "getting stronger the more he fights". The exposure of his strength attracted the attention of Zhao Tianhu, the "King of Black Boxing" who monopolizes underground fighting, and he was forced to sign a life and death certificate and enter the underground boxing world. In the process, he met Su Qing, a daughter of a martial arts family with low-key experience. The two were both enemies and friends, supporting each other. Lin Feng relied on inherited martial arts and practical training to counterattack from community security, KOing all the masters, and finally challenged Zhao Tianhu, breaking the monopoly of underground fighting, reaching the pinnacle of urban martial arts, and becoming the "Security Martial Lord" respected by everyone.
