Help me find pls

Hey guys, I'm looking of this particular manhwa. The main character was like villainess I think she had bluish hair. At first she is disliked by those around her because of her past actions. I think she becomes self aware or something like that and changes. There's kind of a love triangle situation where a Knight training under her house (also her brothers friend) slowly falls for her. But ultimately I think she likes her butler (blond, secretly has magic). Last I read the blond butler guy was leaving MC's household to learn magic and they had this like till we meet again situation.