The story tells that Ji Xuan and Ji Shuang, two siblings, lost their parents when they were young. They were raised by Xu Shu for eight years, and they painstakingly taught them the knowledge of the art of war. Forbidden Art • The method of summoning ghosts. One day, Xu Shu's sister Xu Hong secretly worried that her mother would be taken hostage by Cao Cao to Xu Capital, and forced Xu Shu to join Cao's army, but unexpectedly killed a servant of Tianruo Palace and asked him to hand over the treasure of the palace, the "Seal of Heavenly Brand". He also revealed the surprising fact that Ji Xuan's parents apostatized and fled back then. Although Ji Shuang tried her best to save Xu Hong, who was dying with the forbidden technique and the method of summoning ghosts, the disaster officially started because of this.