Tim (Eric Tsang), Dr Lee (Jordan Chan), Jiao (Cheung Tat Ming) and college student Ah Tsai (Wong You Nam) are always respectful and obedient in front of their wives or girlfriends. In fact, the four of them have an ulterior motive, which is to find an opportunity to go out and fool around after gaining the trust of their significant others. Mary (Teresa Mo), Qi Zhen (Yuen Yuen), Jiao Qi (Josie Ho) and Ling (Lin Yuan) are the partners of the four. At first, they all thought that their significant others were always loyal to them. But the four gradually saw through the men's tricks. In shame and anger, the four formed an offensive and defensive alliance and decided to go out and fool around together to fight back. After the men knew that their significant others had also started to cheat, they became very nervous and began to follow their wives or girlfriends. Can the crisis between them be resolved smoothly in the end?