I'm like 90% sure it's one of John K. Peta's work. Warning though, his works are not for the weak
Edit: found it immediately lol
"[John K. Pe-ta] Dullahan na Kanojo | My Dullahan Girlfriend (COMIC HOTMILK 2022-11)"
And I'll do it again, hold on let me go grab my book of slurs...
But honestly I never really disliked or liked her, I don't think the romance part of this manga is really all that interesting so far tbh.
Almost every page has at least one line that's grammatically incorrect.
Pg 5 "Or get attacked by the local race or monster and broken, hisomi?"
Pg 6 "He will do regular report even if late a little" "healy men(??????)" "I even share my level to that product you know?"
Pg 8 "or suicidal that...