Setting: One is a senior inspector, the other is a trainee inspector, one is an undercover agent, and the other is a university professor. They may not seem to be related, but they have a profound relationship. Other settings: I don't know if anyone has watched Xing Minshan's "The Face". Lu Tianheng's setting is similar to the one in "The Face", with three people, the same appearance, but different fates. Jing Bo's setting is that he has an older brother who has been separated since childhood: Le Bin. Other main characters come from "The Rookie of the Year", "Love Story" and "School Police Sniper". Just use characters, don't get hung up on plot and content.