Chu Yunyao, once a forensic doctor and now a princess with amnesia, wakes in an unfamiliar place with only hazy fragments in her mind. At a palace banquet, she happens upon Shen Ruolan, whose gentle exterior conceals a deep and sinister plot. The signs suggest that someone may have tried to kill Chu Yunyao before she lost her memory. On the surface, Chu Yunyao remains composed, while secretly using modern knowledge and experience from her past life to gather evidence and gradually recover her memories. Meanwhile, Gu Qingfeng, who has come to the capital to sit the imperial examinations, is drawn to Chu Yunyao’s strength and intelligence, and the two fall in love. But Shen Ruolan’s feelings for Gu Qingfeng, along with her desire for the princess’s identity, drive her to push her schemes even further, leaving Chu Yunyao surrounded by danger. After an accident, Chu Yunyao discovers she is not of royal blood. Her true identity is tied to a noble family that was wiped out, and Shen Ruolan’s family was among those who helped destroy it. The truth gradually comes to light. In the end, Chu Yunyao uncovers what really happened, exposes Shen Ruolan’s true nature, and finds proof of her family’s massacre, clearing both their names. Together with Gu Qingfeng, she overthrows the rotten dynasty and ushers in a new era.