Su Wan, the daughter of a guilty minister, was taken into Yeting as a slave. With her photographic memory and clear mind, she started from the lowest level as a secretary clerk and repeatedly broke through the difficulties in the palace female official system. She sorted out 20 years of old files for the Shang Palace Bureau to uncover corruption, identified the tributes from the Western Regions for Si Baosi and found out fakes, and even got involved in the undercurrent between the court officials and the royal family. Step by step, she was promoted to the head of Fengyi Division, but in the confrontation with the powerful minister Pei Yan, she went from testing each other to breaking the situation side by side. In the end, she helped the court to be clear and clear as a female official, and achieved two-way redemption of pure love with Pei Yan.