The tomb of Yan Dong, the former leader of the Six Cavalry Division of Chang'an, was robbed, and the Xuanpin Pearl that suppressed the demon king was stolen, causing demons to rise up in Chang'an City and the people to suffer. The chief eunuch Yu Gonggong (played by Luo Jiaying) ordered Ma San (played by Wu Mengda), Wang Zhuge (played by Jia Bing), Lei Yan (played by Xu Dongdong) and others from the Six Cavalry Division to suppress the demons and pursue the Xuanpin Pearl, and planned a shocking conspiracy. The tomb robbers fled to an inn to hide, but the Xuanpin Pearl was accidentally eaten by the chef Li Chang'an (played by Bao Jianfeng). In order to save his beloved lover Gongsun Yu (played by Clara) and the people of Chang'an, Li Chang'an passed many tests and entered the Six Cavalry Division. In the end, he was reborn from the dead and used the magical power of the Xuanpin Pearl to subdue demons and exorcise monsters...