Can anyone give me a manga or manhwa that's similar to this

You could try shimanami tasogare. It's not a hardcore bl though, but it deals with alot of important themes on sexuality, societal prejudices, and acceptance. It's a masterpiece, you should definitely try it!

Thank you

Also try A Painter Behind the Curtain. It's Historical BL that deals with class discrimination. I would say the writing is on par with Dark Heaven.

Stigma