Jiang (Du Dawei), Chen (Wu Yilong), and Xiong (Wu Huaxin) are three boys from the same village who grew up together like brothers. Xiong secretly loves Jiang's sister, SUE (Luo Le), often finding excuses to get closer to her. After graduating from a pre-vocational program, Hong has struggled to find work, and in order to support his family, he reluctantly ends up working as a shampoo boy with Xiong at a hair salon. Later, under the recommendation of his mother, Aunt Rong (Luo Lan), he becomes an apprentice locksmith, but he has not been able to hold down any job, constantly facing pressure and bullying from adults. Jiang's father is a drug addict who owes a large sum of money to the loan shark, Brother Huo (Wu Zhixiong), resulting in their family being frequently harassed. In their desperate circumstances, the three gun-loving boys boldly form a gang to rob, but their inherently good nature leads to them failing every time, which only ends up causing a series of absurd and ironic mishaps. Eventually, they become involved in a murder case. The investigator in charge of this case is Inspector Li Jiaguai (Li Xiuxian), who has extensive experience in solving cases. With various firearms and explosives, there is plenty of action.