During the Wanli period, the world was peaceful. In the early years, Japanese pirates were rampant, but fortunately, Generals Qi Jiguang and Yu Dayou pacified them, and finally exchanged for today's internal and external peace. At this time, the martial arts world was dominated by the four major families, and anyone who tried to establish a sect must obtain the consent of the four major sects. One day, the city was full of swords, and two mysterious people holding Japanese swords caused the martial arts world to be in chaos. At that time, Qi Jiguang realized the mystery from the way of holding the Japanese sword, so he improved the Japanese sword and used the other's method to return the other's body, which frightened the Japanese pirates. With the death of Qi Jiguang and the stability of the world, the Qi family Japanese sword gradually disappeared, and the Central Plains martial arts world also denounced it as an evil way and refused to recognize it. These two people are the masters of the Qi family camp. They challenged the four major sects, hoping to justify the name of the Qi family Japanese sword. The martial arts sects simply rounded them up as Japanese pirates, and even Qiu Dongyue (played by Yu Chenghui), the first master of Shuangye City who had retired to the mountains for many years, went down the mountain to capture the thieves...