Oh, I finally found it.
Brave double guns:
Synopsis: Xia Zhengyi [Chen Long], a gangster, smuggled drugs, committed many evils and became a rich man. Although the police are well aware of their misdeeds, they lack evidence, so that they can't be brought to justice at the moment. Xia has a ledger that records all his illegal activities, which is kept by his mistress. The members of the anti-gang group who were ordered to investigate were Beethoven [Cen Jianxun] and A Qiu [Richard Ng]. When they were handling the case, they caused a series of jokes and were reprimanded by their superiors. Anna [Ye Dexian], a senior policewoman, has a soft spot for Ah Qiu. With her help, they found an informant, Uncle Wen [Taibao], who visited Xia's mistress in the evening. Unfortunately, they came late. ....
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