Dou Zhao (played by Meng Ziyi), who lost her mother at a young age, was extremely disappointed with human love and family affection because of family changes and a rough fate. She fought against her stepmother and protected the family property. She lived in a remote farm and studied to protect herself. On a rainy night, Dou Zhao met Song Mo (played by Li Yunrui) who was pretending to be a merchant and staying at the farm. She used her wisdom to help him save the orphan of the Duke of Dingguo who had made great contributions to the suppression of the bandits, and the fate of the two was closely entangled. Song Mo, who was born in an official family, was deeply trapped in the mystery of family changes, and Dou Zhao also encountered rumors of marriage exchange under the sabotage of her stepmother. The two chose to get married to form an alliance and overcome the difficulties together. They used to be suspicious of each other, but they helped each other to overcome difficulties, and gradually got to know each other and cherished each other. Unexpectedly, the storm was coming and the court changed suddenly. Dou Zhao and Song Mo joined hands to face the crisis, jointly saving the fate of the family, unraveling the mystery of the Yingguo Mansion's child exchange, successfully stopping Prince Qing's rebellion, redressing the unjust case of loyal ministers, protecting the peace of the country and the home, and living a happy life that truly belonged to them.