What did Q mean in the movie and online drama Detective Chinatown?

In the movie Detective Chinatown, Q was a mysterious character who did not have a specific character setting and did not appear in the movie. However, in the novel The Q-account, Q was a fictional character who was the master of Tang Ren, the detective in Chinatown, and also Tang Ren's recommendation. Q was a mysterious character who was proficient in detective skills and solving puzzles. He seemed to have an unknown secret related to the criminal activities in Chinatown. Q's identity and background were not clearly stated in the movie, but the audience could feel his powerful ability and mysterious aura. In the novel and the movie, Q's identity and background were not clearly explained, but many readers and audiences guessed that he might be an agent of a mysterious organization or individual in charge of handling some important cases and missions. Either way, Q was regarded as a very important character in Detective Chinatown, adding a lot of mysterious elements and appeal to the film.