Widow Cui Shujuan struggled to raise stepson Li Kai and adopted daughter Cui Qianqian. When Qianqian fell critically ill, Li Kai stole her medical funds for his wedding dowry. Billionaire Qin Lang, disguised as a security guard, rescued Cui twice and married her incognito. His CEO son Qin Mujing initially suspected fraud but was moved by Cui's kindness. At a family reunion banquet, shocking truths emerged: Qin Lang's wealth and that Qianqian was actually Qin's long-lost daughter Qin Muke.