This is a Chinese BL (which was cancelled so last episodes aren't available) and has a novel
This also has non blood related brothers' love trope
I also think this drama portraits a realistic poor environment just like Unknown
Also this drama has one sided obsessive lover too

THE BROMANCE is attractive just like The Devil Judge. The Merciless' main character is also well written he is not like Ga On. I think Ga On's character is not developing much throughout the series.
Also you'll like this if you like Vincenzo too.