During the Kaiyuan period, the Tianyuan Dynasty was dominated by He Qing and Hai Yan, and all nations came to court. At the birthday banquet of the Emperor of Tianyuan Dynasty, Prince Shangguan Jingnan was poisoned and fell into coma. The emperor was furious and appointed Zhenbei King Xie Yan to investigate the case. After hearing the bad news, the eldest princess Shangguan Jingrou also searched for evidence in secret. As the search deepens, a series of conspiracies emerge, including Pan's revenge, the destruction of the Duke's palace, her father's suspicion, the concubine's calculations, and the ambition of the courtiers, forcing her to be involved in the whirlpool of power...
