Well, it really depends on the specific 'old police story'. However, it's common to have a central police character, someone who is tenacious and dedicated to his job. There might be his partner, with whom he has a complex relationship. There could also be characters from the community, such as witnesses or victims, who play a role in the story. And of course, there may be the antagonists, the bad guys who are causing trouble in the town and are the focus of the police's efforts.
Since I don't know the exact 'old police story', it's hard to say. But usually, there would be the police officers themselves. Maybe a grizzled veteran cop who has seen it all and a young, eager - to - prove - himself rookie.
In many 'old police stories', there are often a lead detective who is the brains behind solving the cases. There could also be the chief of police who gives orders and manages the department. Sometimes, there are supporting characters like informants who help the police with valuable information. And don't forget the criminals themselves, as they are also important characters in the story as the ones being pursued by the police.
Chapter 405, "The Person Saved Casually Turns Out to Be a Diplomat?!", is the clearest early answer because it turns Foreign Liaison Committee's situation into a concrete plot event. Early on, The medical student was completely dumbfounded..
Chapter 334, "Do you not want to because you look down on me?", is the clearest early answer because it turns Do's situation into a concrete plot event.
Chapter 435, "A Skilled Housewife Can't Cook Without Rice", is the clearest early answer because the violence around Dragon Ridge Island becomes final instead of hypothetical. The chapter gives readers a real answer by opening on The elderly dean looked at Zhao Lang with a tinge of regret.
Chapter 271, "How Did Shen Lan Marry an Old Fool?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from He had barely finished speaking when he received a withering look...
Chapter 570, "A Simple Auto-Attack Baits Out an Ultimate from the Enemy", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with What the heck is that?" "??
Chapter 314, "The teacher will surely cultivate you into a new music star!", is the clearest early answer because it turns Zhou Wenshan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After chatting with Zhou Wenshu for a bit, Jiang Li called Jiang...
Chapter 360, "There's No Shame in Wearing a Dress Designed by Your Mother", is the clearest early answer because it turns Younger President Jin's situation into a concrete plot event. It opens with Jiang Li showed no fluctuations in emotion and remained unperturbed...
Chapter 275, "Five Defects and Three Shortcomings", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. It opens with Hu Zi was exceptionally cooperative, and within half an hour, all the...
Chapter 788, "Don’t be so fierce, I'm scared", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Song Xue covered her mouth in shock. to I really did not push the auntie that day;
Chapter 284, "You'll Never Get Rid of Me!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Bai Lu, also an actress, naturally saw through the insincere...