I don’t have time to watch dramas right now, so please recommend me some of your fave violent movies about gangs, mafias, murderers and anything alike. If the movie is told from the antagonist’s point of view, it’s even better, but that’s optional. I’d prefer it if it’s Korean but i will watch anything really.  I just need something fucked up right now. Thank you!

I don't know if you've watched this, but a Japanese movie from 1979 called Vengeance Is Mine sounds like what you're looking for. It's mostly from the serial killer's POV, the movie largely doesn't try to explain his motives, and the murder scenes are not particularly gory--especially if you've watched a lot of newer movies with stylized violence--but just very matter of fact.