Helpp

Can anyone tell me the name of this story where the fl is white hair and blue eyes, she's a genius at everything she's a sword master i think and just good at everything but she has this dead fish eyes kind of and she wants to be lazy (?) Her older brother looks like her but he's not really the best at swords. Her ml(black hair red eyes) is a student of fl and she taught him to be great at swords. The family of fl is great! Ml is a crown prince.