Lin Zheng once had a happy family, but his younger brother, Lin Yu, attracted the attention of Beitang, an underground boxing syndicate. In a single night, his family was destroyed: his parents were brutally murdered, his pregnant wife lost her life, and his younger brother was forcibly abducted. Narrowly escaping death, Lin Zheng became the disciple of Uncle Zan, an inheritor of ancient boxing techniques, and spent three years mastering ancient Muay Thai. Returning under an assumed identity, he infiltrated the Dawei Boxing Gym to await his chance for revenge. His extraordinary skills brought him into the spotlight when he saved an important guest at a birthday banquet, drawing him into the underground boxing war between Dawei and Beitang. Facing the ruthless Zhou Kun, the poison-wielding master Qingzhu, and Shen Manwu, the mysterious sister-in-law whose true identity remains unknown, Lin Zheng overcomes one challenge after another. In the end, he rescues his younger brother, wipes out the underground boxing syndicates, and restores justice and peace to Yuncheng.