During the Lantern Festival, Princess Huai Si died mysteriously at a night banquet. Li Pei Yi, the chief guard of the inner court, and Xiao Huai Jin, the Lingtai Lang of the Taishi Bureau, were ordered to investigate, and it was finally found that the murderer was the princess herself. The princess who was betrayed not only punished the heartless man but also personally killed the daughter of the powerful who bullied her and finally jumped off the Penglai Terrace to get rid of the fate of marriage. Afterwards, Li Pei Yi and Xiao Huai Jin joined hands to uncover a series of "palace secret history" and strange cases that occurred in the inner court of the Tang Dynasty. In the cases involving the fate of various women in the harem, explore the wonders of the Tang Dynasty and feel the wonders of the world. In the process of solving the case, Li Pei Yi gradually found out the truth behind the Xue family's murder ten years ago and finally exposed the conspiracy of the right prime minister and the concubine. (Source: Chinese = Weibo || Translation = MyDramaList) ~~ Adapted from the web novel "Tang Gong Qi An Zhi Xue Yu She" (唐宫奇案之血玉韘) by Sen Lin Lu (森林鹿).