兰桂坊是香港闻名的酒吧夜店集中地，有人寻找一夜缱绻、有人追求真挚爱情，兰桂坊常客Steven（沈志明饰）遇上空姐Jennifer（连诗雅饰），二人发生一夜情。但他们感觉这次真的恋受了，可惜因为误会令Jennifer心灰意冷下决定绝迹兰桂坊。事隔八个月，Steven重遇日思夜想的Jennifer，更希望能够与她发展，可惜Jennifer竟已成为大老板Leslie的女朋友。朋友以过来人身份劝Steven要像其好友Sean Ma一样，相信自己的感觉，Sean更为荡女Cat付出。Steven决定鼓起勇气去向Jennifer表白自己的心意，可惜一切却为时已晚，Jennifer刚答应了Leslie的求婚。Steven毅然决定接受公司的调动，到外国总公司任职，好友们为他举行Farewell Party，Jennifer再次出现。

夜色中的蘭桂坊是享樂主義者的領域，聚合了各色人物於此尋歡作樂：阿公（單立文 飾）是幫派頭目出身，如今夜夜笙歌，頗得坊間年輕人信服敬重；Jacky（陳柏宇 飾）始亂終棄，面對可能懷孕的玩伴女，如今只想擺脫；酒商銷售經理Steven（沈志明 飾）夜店偶遇空姐Jennifer（連詩雅 飾），出面為其擋酒導致醉倒，Jennifer送Steven回家並順理成章發生了一夜情，二人在一起頗感默契有趣，有意將關係維繫，誰知Steven誤會Jennifer與他人有染，導致後者離他而去。Steven難以忘記Jennifer，在新年派對上拒絕了Milk (楊愛瑾 飾) 的示愛。三個月後，Steven再遇Jennifer，然而此時，她已是老闆Leslie（恭碩良 飾）的女友…

Lan Kwai Fong (LKF), a well-known party location in Hong Kong with loads of nightclubs and bars. Everyone likes to go to LKF for fun, one night stands or even true love. LKF has captured the joys and sorrows of many... One night, Steven - a regular of LKF met the flight attendant - Jennifer. They had sex on the first night they met but both could feel love come along. They had another date on New Year's Eve. Unfortunately, misunderstanding tore them apart and Jennifer decided to disappear from LKF. After eight months, Steven meets with Jennifer again and hopes to restart a relationship with her. However, Jennifer is no longer single, she's now his boss, Leslie's girlfriend. At the same time, Steven receives a call that his close friend collapsed and had to be sent to hospital. His friend encouraged him to follow his heart. When he finally decides to tell Jennifer about his feelings...

Comédie de mœurs qui se passe dans le fameux quartier très animé de Hong Kong.

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