Gu Xiyuan, the legitimate daughter of the Marquis of Pingyang, once sincerely loved the Crown Prince and gave all her money to help him provide disaster relief. However, she discovered that he only wanted to marry her cousin as his principal consort, relegating her to the position of secondary consort. Even her relatives in the marquis's household treated her and her mother as nothing more than money bags. After finally seeing the truth, she empties the marquis's residence, helps her mother obtain a divorce, reclaims her dowry, and petitions the emperor to marry Prince Yan, Xiao Xuan. Their marriage begins as a mutually beneficial arrangement, but as they stand together to humiliate their enemies, punish villains, and unravel court conspiracies, genuine affection gradually develops between them. In the end, the Crown Prince and the marquis's household suffer the consequences of their own actions, Xiao Xuan ascends the throne, and Gu Xiyuan becomes empress. Together, they protect their country and family and share a profound love for a lifetime.