To escape her stepfather's harassment, Sheng Qingli signs a marriage agreement with Pei Mosen, the Pei family's heir, who conceals his identity. Their marriage operates on a strict 50-50 basis. She establishes herself professionally through her expertise, but gradually begins to question her husband's identity. Pei Mosen initially marries her to complete a family assessment, but as they spend time together, he develops genuine feelings for her, confesses the truth, and gives up his inheritance rights. Sheng Qingli uses the law to turn the tide in his favor at a hearing, and together they thwart a hostile takeover. The truth comes to light: twenty years earlier, Sheng's father had risked his life to save the Pei family father and son. The schemes behind everything were actually an act of protection spanning time. In the end, they break free from their constraints, find true love, and establish a legal aid center.