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Mike (played by Andy Lau) is an employee of a security software company in New York. His cat has died, leaving him extremely unsettled. He goes to a priest to pray, but he still cannot sleep peacefully. In his dreams, Mike encounters a strange woman named Ellen (played by Yuan Yuan), who is in a daze because her boyfriend had previously committed suicide by jumping from a building. Mike tries to comfort her, but he repeatedly fails. Due to this bizarre dream, Ellen keeps haunting Mike's mind. He decides to go to Shanghai to find her. By chance, he obtains her photo at a photo shop. Following this lead, he travels to Hangzhou, but he encounters Ellen's twin sister instead. It turns out that they are orphans who were placed in separate foster homes. Mike dispassionately returns to New York, but his heart is filled with confusion, leaving him in a state of not eating or sleeping, which even makes his colleagues feel cold. He returns to Shanghai again and meets Ellen's sister once more. However, when they both open up about their feelings, their relationship undergoes a complex transformation...