Hairdresser Ji Akai (Jacky Cheung), fashion designer Da Yanlong (Mo Shaocong) and Feng Shui master Lai Buding (Stephen Chow) are three best friends who jointly opened a trendy hair salon. Unexpectedly, they had a dispute with the owner of the barber shop next door on the opening day. Fortunately, the shop owner's daughter Ya Ying (Sharla Cheung) intervened in time to calm the storm. During the process, the three were attracted by Ya Ying's charm and began to frequently visit her house to show their affection in order to win her heart. After a dinner party, the three got drunk and slept in the same room with Ya Ying by mistake, causing Ya Ying to become pregnant. In order to live with Ya Ying, the three rushed to take on the role of prospective father. Because the three had the same blood type, the hospital could not test who was impersonating. Ya Ying's parents decided to first examine the performance of the three. In order to become the best son-in-law, the three tried their best to compete fiercely.