Lan Zhi falls in love with the young heir of the Duke's manor, but when he cannot take her as his official wife, she vows never to marry. He agrees to wed a prime minister's daughter but insists on bringing Lan Zhi into his household, which she refuses. Lu Siyu, who has secretly loved Lan Zhi, disguises himself as a servant to propose, and she gladly accepts. They live a respectful and harmonious life until the heir repeatedly harasses Lan Zhi and even kidnaps her. Lu Siyu dies saving her. Years later, the heir finds her, and Lan Zhi agrees to marry him, secretly planning revenge. In the end, she succeeds and ascends the throne with her son.