Su Jinhuang, the former princess of the dynasty, was poisoned and reborn as the daughter of the current imperial tutor. However, she found herself involved in a serial murder case and became the main suspect of Xie Wujiu, the minister of Dali Temple. In order to find out the truth about the destruction of the country in her previous life, she infiltrated the scene of the case as a "guppet", but gradually discovered that Xie Wujiu was actually the reincarnation of her fiancé in her previous life. While investigating strange cases such as the "Lantern Murder Case" and the "Red Silk Hanging Corpse Bureau", the two uncovered layer by layer the shocking conspiracy that led to the change of imperial power twenty years ago. Su Jinhuang's dual identity is both an outsider and a chess piece in the game...
