On the Chinese New Year, Princess Huaisi was mysteriously killed at the night banquet. The inner court guard Xue Peiyi and the Lingtai Lang of the Taishi Bureau Gu Heng were ordered to investigate and peel off the cocoon. Through the domineering daughter of powerful people and the secret General of the Jinwu Guard, Yulin Lang, finally found out the truth and found out the real culprit.Subsequently, a series of complicated and strange cases that occurred in the Tang Dynasty's inner court followed one after another.In a series of cases involving the fate of women in the harem, Xue and Gu explored the wonders of the Tang Dynasty, felt the strangeness of the world, and in the process of solving the case, they gradually found out the truth behind the Xue family's family destruction ten years ago, and finally revealed the conspiracy behind the mastermind.Xue Peiyi not only cleared her father General Xue from his grievances, but also established a deep relationship with Gu Heng in the process of pursuing the truth.  

Through complex cases and characters, this drama shows the good and evil of human nature, love, hate, and love, and conveys the persistence of justice and truth.