Shoujo

Helpp i can't remember this modern shoujo mahnwa i read where guy and girl have this master-servant relationship because of a curse? And that it's somehow related to their family ancestors and that before the mc and ml, their ancestors used to be strictly the same gender (like mc's father and the ml's father were the ones affected with the curse etc etc) but then in the first time in their family history, mc and ml has different genders hence romance bloomed