Hiii! So, I did a little research and it's prolly one of these bl's, but idk for sure srry if it's not... But if not I'll try to find it for you. These are also quite similar to to what you're trying to find so maybe you'll enjoy them too. Anyways, I wrote too much so here you go lol:
Moonlighting/Night work (Korean title:야간비행)
Dubble trap/Mangjong/Degenerate
Grain in ear(I don't think it's this one but who knows ;))) )
Hope one of these is ittt! Have fun reading(´▽`ʃ♡ƪ)
Despite that
Just realized I mixed up Dubble trap and Grain in ear
Dubble trap
Grain in ear/Mangjong/Degenerate
If you mean double trap, it doesn't really have a similar plot lol
Ff bc this sounds interesting lmaooo
This maybe? https://www.mangago.me/read-manga/despite_that/
the mc is a police officer w black hair, and there are 2 mls, one is a blond POOKIE WOOKIE GOLDEN RETRIEVER who was saved by mc at one point i think, and the other is this black haired gangster who sells drugs or smthng that the mc is investigating but also has history with mc. i remember reading this on bato AND I NEED TO KNOW WHO MC ENDS UP WITH (PLS BE THE GOLDEN RETRIEVER PLSPLSPLS)