Liu Pingguo (Fan Bingbing) works as a massage girl in a foot-washing city in Beijing. Her husband An Kun (Tong Dawei) is a worker responsible for cleaning the French windows of high-rise buildings. The two live in poverty, but they love each other. Lin Dong (Tony Leung), the owner of the foot-washing city, is a lustful Hong Kong businessman who often finds different ladies to satisfy his physical needs. His wife Wang Mei (Jin Yanling) is infertile and runs a beauty salon. The two have a cold relationship. One day, Liu Pingguo's friend Xiaomei was fired for offending a customer, and the two got drunk. The confused Apple accidentally walked into a foot bath room, which happened to be Lin Dong's lounge. The two had sex, but were seen by An Kun who was washing the windows. An Kun wanted to blackmail Lin Dong and went to Wang Mei to negotiate. The angry Wang Mei wanted Lin Dong to taste the taste of "wearing a green hat", so she had sex with An Kun. At this time, a bigger change occurred. Pingguo is pregnant, and who is the father of the child has become a bargaining chip for Lin Dong and An Kun to gamble. The four of them sign an agreement that if the child is Lin Dong's, he will give the two a compensation of 120,000 yuan, and if it is An Kun's, the two sides will not owe each other anything...