In an inconspicuous corner of a lane in Shanghai, Aliang (Haruma Miura), a Japanese youth, is working hard to learn the technology of making mechanical watches. He accidentally met a beautiful woman, Ruolan (Liu Shishi) in the swimming pool. At her invitation, Aliang helped her choose a gift for others. With this opportunity, Aliang got to know Ruolan and her twin sister, Rumei (Liu Shishi). Unlike the calm and quiet Ruolan, Rumei, a well-known model, is generous and cheerful. But in further exchanges, Aliang discovered that Ruolan had a deep resentment that Rumei had taken away many of her things, and even Tianlun (Zhang Xiaoquan), the person she liked at first, has now become Rumei's fiancé. The two lonely people opened their hearts, and Aliang and Ruolan fell in love. Who knew that fate took a sharp turn for the worse, and Rumei and Ruolan made an appointment to go to Mauritius for a single trip before marriage, but an accident happened. Only one of the sisters came back, and no one could tell who she was...