Xu Cheng, the contemporary heir of a traditional Bajiquan family, advanced all the way in the "Zhenwu Fighting Championship", but was unexpectedly defeated by Jason, an American fighting master, and his life and death are uncertain. Xu Cheng's younger brother Xu Shi originally chose to study for further studies. After learning that his brother Xu Cheng had an accident, he stood up again to take up the responsibility of the heir of the Bajiquan family. Xu Shi discovered that his brother's serious injury was caused by Ma Yuanlong, the chairman of the "Zhenwu Fighting Championship", who used the competition as a gambling game and abused banned drugs. With the help of Lin Wan, a fellow senior sister who returned from overseas, Xu Shi participated in the "Zhenwu Mixed Martial Arts Championship" as a fighting boxer and designed to investigate the truth behind Xu Cheng's serious injury. At the same time, the past between Lin Wan's grandfather Lin Zongying and Xu Shi's grandfather Xu Chengzong, which was related to the inheritance of Bajiquan, also made Xu Shi and Lin Wan think about the past and future, inheritance and development of Bajiquan. Amidst the difficulties and grievances, Xu Shi remained true to his original aspirations and insisted on his duties as a boxer, fighting for the family honor and the inheritance of Bajiquan.