πI have a few novels to recommend to you, all about urban undercover! The first one was " Hong Kong: I asked you to save people with money, but you became a big shot ", which told the story of a lost undercover agent making a lot of money in a parallel world of Hong Kong movies. The second one was " Xiangjiang: When the Wind Reappears ", which was about the car valet under the gang leader Ren Qingtian, who rose to become a real undercover agent. There was also " Hong Kong: Big Boss, I Only Want to Make Money ", which told the story of a police undercover agent who chose to make money after five years. I hope you like my recommendation.π