Jeannie(张柏芝饰)是一个空姐,与工程师Alan(陈奕迅饰)相遇在同一辆车上,之后便开始了他们的爱恋。刚开始的时候,两人都打得火热,深深投入到彼此的生活,如胶似漆。跟很多恋情一样,Alan厌倦Jeannie对他管太紧的方式,开始挣扎,Jeannie认为自己已把一切给了男友,便全身心投入感情,但渐渐的两人之间当初热恋的感觉不再,感情转淡。Jeannie努力挽回感情,两人也复合了,Jeannie在这时才发现自己已不再爱Alan了,导致最后分手收场。Jeannie消失于Alan的生活中,独自一人继续游走在繁华的都会里,寻找另一个“十二夜”,她也遇到了另一个令她心动的人。Air stewardess Jeannie meets engineer Alan on a bus and the two start their love. The two are deeply attached to each other at the very beginning and feel the passage of affection as time goes on. They break up ultimately and start to find their new other half.