Wudang abandoned disciple Dai Yan in order to rob Gu Jian of the Qing Dynasty to attack Tiexiao Belle Mansion at night. Yu Xiulian came back to the Jianghu and joined hands with her old friend Meng Sizhao to protect the sword. Luo Xiaohu, who was deceived, helped her. After giving birth to her son Tieping, Yu Jiaolong was switched, and as a result, she was replaced by her daughter Xueping. The mystery of her life became an important clue. The adopted daughter Xueping secretly helped her and Tieping's father and son to recognize each other and reveal the truth. There was a river and lake scuffle, and everyone tried to capture Dai Yan.