In the sixth year of Baoyou, the Mongol army pressed the border, and Fan Chengshun general Zhang Tianshun saved the people of Fancheng, handed over the yellow dragon sword containing the anti-yuan roster to the partial general Fan Guoxing, and then killed himself, so that Guoxing sent his head to surrender the enemy. Since then, Guoxing has been known as a traitor, and his son Fan Qiu was born in the countryside and lived incognito, and many years later he was discovered by Mrs. Qiu Wan, who "pierced the heart with a sword". During Qiusheng and Guoxing's exile, he met Liu Qinglian, who was ordered by his mother to insist on a duel with Mrs. Wan and killed her with her own hands. On the other side, Zhang Qi, who had been adopted by a Mongol since childhood, was arranged to appear as the son of Tianshun, and colluded with Ling Chufeng, the head of the famous sword gate, in an attempt to eliminate the anti-Yuan forces in the Central Plains.