She witnessed the tragedy ten years ago and has been blind since.
She was rescued by the aloof man ten years ago, and her life changed from then on.
She has never forgotten the blood feud and has been looking for the person who destroyed the family...
In fact, he shouldn't have saved her back then. In fact, they shouldn't have had any intersection in the first place. If it hadn't been for her, he would have wielded the sword without hesitation; if it hadn't been for him, she wouldn't have saved him from the poison. So they are destined to be tragic...