It's not a very popular trope, I only know one manhwa:
https://www.mangago.me/read-manga/like_share_n_subscribe/
Np! Also yeah it's just not a popular trope in non-BL works in general, not really sure why. There is another one I can think of, but it's less of a romance and more of a drama:
https://www.mangago.me/read-manga/ohana_holoholo/
But if you're not into slow burns, or don't like seeing F/M relationships in a GL, just ignore.
soo i love the parent??? or found family genre "cough" since i didn't have a good one anywayssss i was wondering if there's any gl ones? since the one i mostly see is two dudes taking care of the kid not that I'm complaining but i wanna see it in gl so if you know any drop link pls and thank you