Katamuku Karada
I'm how I feel about this one. I think their needs suit each other, and they learned what they want (top is aggressive but loving, bottom is a M who craves attention) A little too noncon-y for me, but it had a happy ending.
Roses and Champagne
This is a suspenseful, dark romance centered around the head of a Russian Mafia family and a Lawyer. Both characters have a lot of depth, and we continue to learn more about their backstory as the manhwa progresses. The lawyer has a strong personality, and always pushes back against anything he believes goes against his principles (including the Russian). There are a lot of silly, cute scenes between the MC's, which help offset the darker themes. If you enjoy Mafia/Yakuza themed dark romances, I think you'll really like this! The art style is unique and expressive, there are several great plot twists, and the character development is subtle but consistent.
The Time a Gangster was Reincarnated as Ranmaru Mori