I want to say between 2020-2022 I came across a promo for a (I think) manhwa that I'm now desperate to find. I honestly can't remember much but I remember it had a unique art style, something along the lines of Mother's Contract Marriage. It was definitely full color and I believe started out as a fairytale almost? A little girl was adopted by a "monstrous" man (some type of immortal?), or at least she was allowed to stay with him as long as she wasn't a bother. I know that this is so vague but I really don't remember anything, except I think people were hoping the male lead wasn't the adoptive guardian. It was definitely a historical european-like fantasy, and potentially magical with the supposed ML a "monster". There was a butler I believe that brought the girl to the monster. It wasn't an isekai as far as I remember.