I Became the Strongest in the Romance Fantasy

I was reincarnated as the older sister of a villain who kills and harms the people around the protagonist.
But her younger brother is kind, their parents are wealthy, and the family is harmonious.“Wait! Now that I think about it, this is a romance fantasy world. Does that mean I can expect some romance with the male lead?”That silly thought happened ten years ago. But now, what has become of me?
My body is stronger than a rock, my hearing can catch sounds even outside the village, and my swordsmanship can cut most monsters in half.
I have become one of the top warriors of the empire… No, I’ve become the strongest knight in the empire.