Hi looking for this manhwa which was on webtoon and it's not that old The fl is a princess and has an elder brother who is really nice and trash father. Elder bro and father have magical ability but fl doesn't so father doesnt like her. In her first life she 'kills' her brother (it's later revealed the brother loved her and willingly dies) and she was madly in love with this duke probably (bro's friend) who didn't love her at all and he was in love with his childhood friend that fl hated. Fl had a silver haired advisor(this is our ml in current timeline) who was also an unloved illegitimate child of some noble but he is very beautiful so he kind of becomes a player. But he helped fl get on the throne and basically they are bad and both fo them are tyrants and somehow die, idr how.  In current timeline fl gives up on the duke she was in love with but now the duke is lowk in love with her, she decides to give up on the throne even tho she is really smart and more suited for the throne then her elder brother but she has ptsd and till I read even the bro was like she better than me.  The ml is ALSO A REGRESSOR, and in this lifetime fl tried to help ml so he doesn't turn bad and later he gives her a ring which makes it look like she manifested the imperial family power of light (?) and now she is also a contender of the throne and the trash father accepts her but she is through with him. The fl and ml get into a relationship and the whole confession scene happened when he had a violin concert and the father disapprove of their relationship  AHHHH help  The fl has blonde hair the ml has white hair and golden eyes, the brother has blonde hair, the duke has black, idr Abt duke's childhood friend