I hope you like this one https://www.mangago.me/read-manga/my_in_laws_are_obsessed_with_me/
they both eventually are aware of each other's feelings in recent chapters, it's kind of a slow burn but it's really good!
and I realized you said manga but the one I recommended is a manhwa, Is that okay?
That's ok, thank you!
Not really arranged marriage but more to flash marriage https://www.mangago.me/read-manga/match_made_in_heaven_by_chance/
Feel free to have a go at these
https://www.mangago.me/home/mangalist/2095297/
Any guy x girl arrange marriage that turns out well?