Ji Fu takes her younger sister's place and marries Zhou Yuyan, whom she has secretly loved for years. On the day they register their marriage, Zhou Yuyan leaves for another country. Seven years later, Zhou Yuyan returns. By then, Ji Fu has changed her name to Tang Ning and unexpectedly ends up sleeping with Zhou Yuyan. Zhou Yuyan's feelings for Tang Ning gradually shift from dislike to affection, yet he never realizes that the woman he has fallen in love with is actually his own wife.