The story takes place in the early years of the Republic of China. The Huo family and the Zhao family are the two giants in the martial arts world today. They have been fighting over who is the authentic secret boxer. Huo Yuanjia is the fourth son of the Huo family. People are not optimistic about him because he has been frail and sick since he was a child, and they are not prepared to teach him martial arts. However, Huo Yuanjia, who is extremely perceptive, actually realized the Mizong Fist on his own. On the day when the two families agreed to compete, He used the Mizong Fist and defeated his opponent Cheng Tianxiao. Unexpectedly, Cheng Tianxiao suffered a huge blow and passed away. His apprentice Chen Zhen worshiped Huo Yuanjia as his master. A group of people came to Tianjin. Huo Yuanjia, who was highly skilled in martial arts, quickly attracted the attention of the Japanese and was hunted down. They could only take Qiannan to flee to Beijing and set up the Jingwu Sect.

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