During the Dazhong period, on a rainy night in Chang'an, seven female corpses with uncorrupted faces, dressed in wedding clothes, appeared in an underground culvert, arranged in a strange circular formation, emitting a strange fragrance. At the scene of the crime, there was only a blood-red jade lotus engraved with the character "Xuan".
Pei Zhiyuan, a stern and solemn French cao who abides by the "Tang Law" wholeheartedly, is ordered to investigate and solve these mysterious cases. However, he encounters the most unruly partner - Li Xiaoxiao, the unparalleled and eccentric princess of Yong'an Princess. She climbed over the wall, forced herself into the case, and said with a smile: "Master Pei, handling cases according to the law is so boring, I will help you break the rules!"
He uses rules as his blade, and she uses intuition as her edge. One is reeling from the prison sentence, while the other is wandering the streets and is well versed in the dark side of Chang'an. The secrets of Honglianfang, palace mysteries, and poisonous techniques came one after another, and murderous intentions lurked under the prosperity of the Tang Dynasty.
Seeing how the princess disturbed Fa Cao's heart, he forced him to say urgently: "Princess, please handle the case according to the law!" But she smiled like a flower: "What if I don't? Could it be that your lord... Wants to punish me?"
