I found a list that u might like. It's called freak4freak
https://www.mangago.me/home/mangalist/3288591/?filter=&page=2
OMG I’M SO SORRY for disappearing after you took the time to write all those recommendations… (╥﹏╥)
I actually came down with a really bad fever that day, and after I started feeling a bit better I got completely sucked into a novel. I found it while looking for more stories like this, and it’s been scratching that exact itch for me LOL. I’m still reading it, but it’s REALLY good (might be peak) so far, so I never opened Mangago again until now
Thank you so much for the recommendations and the list!! I’ve already read The Story About a Human Who Wants to Date a Non-Human (I really liked that one!!), and I’ll definitely be checking out the list too!(๑•ㅂ•)و✧
Sadly, I mostly have novels to recommend… (⸝⸝๑﹏๑⸝⸝)
I’m not a huge BL manhwa reader, so besides the ones that have already been recommended here in the replies, the only other one I can think of is Cozy Obsession (I read the novel, but it has a manhwa too!). I can think of a few short stories (like Getting Delivered) and even stuff like No Returns After Use, but at least to me they don’t really have the kind of dynamic.
But if you’re okay with novels, I’d be happy to recommend a few! (˶ᵔ ᵕ ᵔ˶)

Does anyone know a story where the ML is obsessive, possessive, yandere, a stalker or just generally a little (or a lot) unhinged… but the MC is actually into it? (ᵕ—ᴗ—)
Male or female MC, I don’t mind. I just want the MC to genuinely lowkey fuck with the ML’s crazy instead of constantly trying to run away or “fix” him.
(The important part is that I don’t mean stories where the MC is terrified at first and eventually falls in love anyway. I’m talking about an MC who genuinely likes that kind of behavior from the start, or at least very early on. Bonus points if the MC is otherwise a pretty normal person and just happens to have a preference for unhinged people…) ┗( T﹏T )┛