Wu Yaqiu (played by Ng Yiu-hon) and Bei Duofen (played by Sham Kin-hun) are a pair of funny police officers in the anti-triad group of the Hong Kong Police Department. The brothers are lazy and idle, and they are still junior police officers after more than ten years in the industry. Fortunately, they are optimistic by nature, and Chen Sir (played by Chan Yan-kin) takes care of them, so they enjoy such a carefree life. As the saying goes, fools have foolish luck. Yaqiu accidentally got the favor of Chen Sir's female secretary Anna (played by Deanie Ip). They were ordered to investigate Xia Zhengyi (played by Chen Long), a businessman who became rich by engaging in illegal activities, but the other party was extremely cunning and did not reveal any flaws. Xia's mistress had the account books of his various criminal activities and used them as a threat. Xia ordered his men to kill his mistress, and Yaqiu and Bei Duofen became the first to discover the body. In order to get the account book, Xia Zhengyi reached out to his mistress's cousin. Can Yaqiu and Bei Duofen bring the criminal to justice?