Not sure if it this one:
https://www.mangago.zone/read-manga/aniki_no_ichiban_oishii_tokoro/
OMG I FOUND IT! https://www.mangago.zone/read-manga/in_a_heartbreak/
it is a really good manga im pretty sure this is the one because they are both blonde. one is bad and one is like a good student type. and the bad one confessed to the black hair boy. HOPE THIS IS THE ONEEE
https://www.mangago.zone/read-manga/in_a_heartbreak/
Im 99% sure this is the story. everything fits EXACTLY. two twins, both blonde, one bad and one good. confessed to black hair kid and later found out they really had feelings for each other
OMG thank u I have been searching for.it for.months ur the best have a good day
In this mangawebtoon they were tow twins all with blond hair one good kid and one bad boy and the bad boy confessed to a black haired kid and he said yes but did not like him kinda? And then in one chapter we learn the good kid likes the black hair one too ┗( T﹏T )┛