In her previous life, Shen Lingyi was hopelessly in love with her fiancé, Xu Yanqing. Yet for years, he pretended to suffer from face blindness and deliberately married her elder sister, Shen Lingshang, on their wedding day. Shen Lingyi was forced to become a concubine in the Xu household, where she endured endless humiliation and suffering before dying in childbirth. Only in her final moments did she see through the carefully orchestrated deception. Reborn on the very day of her wedding, her heart already dead, she willingly takes her sister's place and marries Xiao Heng, the notorious and ruthless Regent. But after their marriage, Xiao Heng not only refrains from mistreating her but instead cherishes and protects her at every turn. As they spend time together, love gradually blossoms between them. Meanwhile, Xu Yanqing finally realizes his mistake and is consumed by regret. He repeatedly comes to harass her, only to have Shen Lingyi firmly cut all ties with her past.