well for starters you could follow lists from this site with tags like established romance, so you'll know they are already in a relationship but will have problems along the way. but if you want like a misunderstanding but they do loooooove each other, i suggest you read Why Are You So Kind To Everyone Except Me? its soo good, the love was there but its not yet through lmao
https://www.mangago.zone/read-manga/koishite_kissshite_kanjaitai/
https://www.mangago.zone/read-manga/why_are_you_so_kind_to_everyone_except_me/
https://www.mangago.zone/read-manga/muhyeok_x_naui/
https://www.mangago.zone/read-manga/i_didn_t_expect_a_scandal_like_this/
https://www.mangago.zone/read-manga/chirijiri_yuku_no_cookie_jar/
pls recommend manga where the main couple are just so incredibly in love like i’m talking iris by the goo goo dolls in love, i don’t mind bl, gl or straight romance :))