Lung (Nick Cheung), a hardworking property agent, is facing a serious situation in life. His girlfriend won't marry him unless he can buy her a 1000-sq ft. apartment in one year's time; whilst Charlotte (Sammi Cheng) desperately needs a place to stay after her divorce. Along with Lung's intern Very (Oho), a mainland richling, they become co-owners of the office girl Hak's (Angelababy) small flat that was left to Hak by her estranged mother. 快餐喜剧与炒房指南。与人交心，和人过。寡然无味的同居。除了苦大仇深的警匪片，港片还有点别的。港片现在就这水平？。有情饮水饱+1000。电影与城市小市民生活。虚张声势的鸡汤。看过最深入浅出没有讲道理只有铺事实地阐述爱情和生活的电影。房子和家是永恒的辩证题，只不过需要遇见合适的人。 项少龙（张家辉 饰）是一名房地产经纪人，和相恋多年的女友求婚之时，女友竟然嫌弃项少龙拿出的婚房面积太小，声称不购入豪宅便休想结婚，为了娶到心爱的女人，囊中羞涩的项少龙想破了脑袋却也找不到解决问题的办法。 就在这个节骨眼上，一幢名为“天下无双”的豪华别墅低价开卖，凭借着敏感的职业直觉，项少龙从中发现了商机，他找来了金凤（郑秀文 饰）、阿黑（杨颖 饰）和瓦力（欧豪 饰），四人共同分担房款，盘下了别墅，只待炒高房价便可出手大赚一笔，可是，就在此时，政府开始打压楼市，无奈之下，项少龙一行人只得先行入住，一个奇特的“临时家庭”就此组成。
