Man i got you covered
http://www.mangago.me/read-manga/deadlock/
*prisoners*
http://www.mangago.me/read-manga/stanley_hawk_no_jikenbo_kamen/
*detective and boss*
http://www.mangago.me/read-manga/black_mirror/
*police officer & killer dude. this one's not as good as the first two though*
http://www.mangago.me/read-manga/in_the_dark/
*policeman and a profiler*
http://www.mangago.me/read-manga/devil_s_thoroughbred/
*gangsters. Oneshot*
http://www.mangago.me/read-manga/intense_lee_kyung_ha/
*both in a mob*
I recommend the first two the most
please rec some good mangas / huas / hwas with a male mc that’s a detective / police officer / murderer or whatever- preferably completed but an ongoing one’s fine too ~