brooooo the way i think i know exactly what you were talking about but could not rmr the name for the life of me! i knew i had it saved somewhere but it took sooo long to find so o seriously hope this is the one you meant ╥﹏╥
https://www.mangago.zone/read-manga/i_have_to_be_a_great_villain/
omg noooo i could have sworn that was it earlier but actually now that i reread your comment i realize i got lost in translation In the one i linked it’s actually the mc that is the “brother” (not related by blood) and he’s the one that changes his personality and gushes over how cute the villain ML bc he’s a child a first. So close yet so far LMAO
But damn now i do wanna see the one you actually meant so i’ll stay posted in case someone else finds it LOL
Help, its a manga where the mc is a child, and hes actually a villain(?) hes trying to change his personality and his brother always gushes bc he’s adorable. If I remember, he has maybe one or two brothers and its bL but in the future