Hong Kong Movie: a Police Boss Started Out as an Undercover Agent

Why did I suddenly travel through time as soon as I fell asleep, returning to Hong Kong Island in the 1980s from 2020? It's a bit embarrassing that this world is actually the fusion of Police Story, Captain America, Young and Dangerous, God of Gamblers series… and many other worlds. My predecessor is about to graduate from the police academy. Are you kidding me? It's hard for people in this kind of world to live well. They also asked me to be an undercover agent. Let's see if the main leg can survive This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.