After Zhang Zhaofu's mother is reborn, she firmly believes that her younger half-sister saved her in her previous life. She forces Zhang Zhaofu to surrender the credit for saving the Crown Prince and marry a lowly servant. However, Zhang Zhaofu has already planted a hidden danger when she rescued the Crown Prince. After her younger sister falsely claims the credit, she becomes embroiled in a poisoning scandal involving the Crown Prince. Faced with her mother's favoritism and her family's schemes, Zhang Zhaofu remains calm, maneuvers carefully, and seeks to protect herself. Wei Runzhi, an Assistant Minister of the Court of Judicial Review, gradually uncovers the truth during his investigation, turning the characters' fates upside down.