Su Huajin has been married to Gu Huaisheng, the Marquis of Dingyuan, for fifteen years, devoting half her life to managing the marquis's household. Yet she has secretly been suffering from a terminal illness. At the ceremony to appoint the heir, Gu Huaisheng suddenly announces that he intends to make the son of his concubine, Shen Rushuang, the heir, denying his legitimate son Lang'er, who is disabled, and even taking away Lang'er's betrothal. Heartbroken, Su Huajin asks for a divorce, only to endure one humiliation after another. She also discovers that Shen Rushuang was responsible for Lang'er's fall from a cliff, which left him disabled. After her birth family takes her home, the truth about the illegitimate son and the stolen honors is gradually exposed. Gu Huaisheng finally comes to his senses and kills Shen Rushuang. He uses a life-sharing parasite to exchange twenty years of his own lifespan for hers, spending the rest of his life atoning for his sins. But even then, he never receives her promise to reunite with him in their next life.