阿宝在与Ryan婚礼一个月前，拿到了对方的手机并得到了其中的自拍偷情视频，在二人的婚礼上，阿宝为报复丈夫，将视频当众播放并宣布即刻离婚。但离婚的两人并未割断联系，阿宝租用Ryan的铺面开店，而Ryan则不时需要前妻救场，来赶走那些粘人不放的小情人。Ryan以给前妻找男友为借口，将阿宝诓骗到换妻聚会中，并结识了世杰夫妻俩，Ryan与世杰妻子曼丽寻欢，而世杰亦对阿宝动心并展开攻势，阿宝防线终被世杰击破，但他们的交往却引起Ryan醋意。经此一事，Ryan意识到自己始终在乎阿宝，试图挽回失去的爱人。

阿寶（佘詩曼 飾）在與Ryan（方力申 飾）婚禮一個月前，拿到了對方的手機並得到了其中的自拍偷情視頻，在二人的婚禮上，阿寶為報復丈夫，將視頻當眾播放並宣布即刻離婚。但離婚的兩人並未割斷聯繫，阿寶租用Ryan的鋪面開店，而Ryan則不時需要前妻救場，來趕走那些粘人不放的小情人。 Ryan以給前妻找男友為藉口，將阿寶誆騙到換妻聚會中，並結識了世傑（羅仲謙 飾）夫妻倆，Ryan與世傑妻子曼麗尋歡，而世傑亦對阿寶動心並展開攻勢，阿寶防線終被世傑擊破，但他們的交往卻引起Ryan醋意。經此一事，Ryan意識到自己始終在乎阿寶，試圖挽回失去的愛人……

在寶（佘詩曼飾）和強（方力申飾）的婚宴上，投影機原本正播著他們相戀的過程，突然畫面閃出強跟性感女子做愛的片段。寶冷靜地走到台上宣佈離婚，並將婚禮即時取消。這件事迅速成為網上熱話。 一年來，回復單身的寶與風流快活的強繼續保持友好關係。一天，爛滾愛玩的強竟帶寶參加換妻派對；保守的寶本想離開，但遭強威迫利誘而無奈參與。在換妻派對上，兩人遇上杰（羅仲謙飾）與其妻曼麗（傅嘉莉飾），四人發展出浪漫而火辣的關係…… 這邊廂，在另一個婚宴上，當投影機又是播著新郎（陳智燊飾）與新娘（陳嘉寶飾）的溫馨片段時，畫面又閃出意想不到的片段……

During Bo and Cheong's wedding reception, a video clip intending to show their journey of love suddenly flashes a clip of Cheong being intimate with another woman. This leads to the cancellation of the wedding. A year has passed and the single Bo and flirty Cheong maintains their relationship as good friends. One day, the womanizer Cheong brings the conservative Bo to a wife swapping party, at the party, they meet Kit and his wife Man Lai. The four developed a romantic and passionate relationship.

Durante a receção de casamento de Bo (Charmaine Sheh) e Cheong (Alex Fong), um videoclipe com a intenção de mostrar sua jornada de amor de repente mostra um clipe de Cheong sendo íntimo de outra mulher. Isso leva ao cancelamento do casamento. Um ano se passou e o single Bo e o namorador Cheong mantêm o relacionamento de bons amigos. Um dia, o mulherengo Cheong leva o conservador Bo para uma festa de troca de esposas, na festa eles conhecem Kit (Him Law) e sua esposa Man Lai (Kelly Fu). Os quatro desenvolveram um relacionamento romântico e apaixonado.