In her previous life, Shen Qingyuan, the legitimate daughter of the Prime Minister, was hopelessly in love with Pei Yanzhi, the heir of the Marquis of Yongning. After marrying into the marquis's household, she endured endless cold treatment and tragically died from a hemorrhage while heavily pregnant. Reborn, she immediately tears up her marriage contract and volunteers to replace her half-sister as the new empress. In the imperial palace, the Empress Dowager repeatedly schemes to frame her, but Shen Qingyuan outsmarts her at every turn. Meanwhile, her relationship with Emperor Gu Yan gradually develops from mutual suspicion and political calculation into genuine affection, transforming a marriage of convenience into a sincere lifelong partnership. When Pei Yanzhi regains his memories of their previous life, he is overwhelmed with regret and tries to make amends, only to be firmly rejected. In the end, the emperor and empress join forces to put down the Empress Dowager's rebellion and clear the injustices of the past. Pei Yanzhi departs for the northern frontier to guard the borders, while Shen Qingyuan and Gu Yan remain together for the rest of their lives, finally finding their happy ending.