Three years ago, the entire Zhenguo General Mansion was massacred, but only the eldest daughter Shen Zhiwei escaped by chance. She kept her name anonymously and transformed into the gentle and frail medical girl "Wei Wan", dormant in a corner of the capital. While saving lives and healing the wounded, she weaved a huge web of revenge for her family. During an assassination, she was forced to save the seventh prince Xiao Jinyu who was seriously injured and pretending to be idle. From then on, her superb medical skills and extraordinary calmness aroused the deep suspicion of the sinister prince. Xiao Jinyu sees through her identity and proposes a deal where everyone gets what they need: he helps her reverse the case, and she seeks power for him. From then on, the two walked side by side in the turbulent court hall and deep palace. She uses medicine as a blade and strategy as a chess, mediating between the harem and the front court, breaking conspiracies, quelling wars, and winning the hearts of the people; he uses love as a net and power as a shield to resist open and secret arrows for her, protect her, and lead her to the light. From using each other to relying on each other in life and death, they not only want to uncover the truth about the murder of the year and kill their enemies, but they are also willing to work together to clear up the dynasty and restore peace to the sea and rivers in the world. When the dust settled, he came to the Ninth Five-Year Plan, and what he gave her was not a cage with a phoenix crown, but half of the country, holding chess pieces together, and writing a legend of an emperor and empress that was different from any legend.