"To take an Enemy's Heart"
https://www.mangago.me/read-manga/to_take_an_enemys_heart/
At first, I thought it was the crappy translations, but bro fell in love not even a week after getting his family slaughtered by the love interest all while getting beaten and tortured Bro's blinder than my mom that stayed with my abusive and manipulative dad
Author's have gone crazy like no offense but the plots are bland with wattpat shit