I WANT YALL OPINIONS ON A FANFIC IM WRITING

Im a highschooler and has been wanting to write a joongdok fanfic for a long time. I have an idea of making a kdj x police yjh because kdj seem to have a officer trauma from his dads death because of the officers who interrogated him and stuff. But i just cant seem to come up with a way for yjh cop to come into kdj like without kdj a serial murder or crimal. So pls give me a suggestion on a petty crime he could get away with that isn't serious but normal yk like a normal crime 😭😭😭😭😭. idk if i shud post it cuz it cuz its my first fanfiction and idk if anyone would read it