Maybe she’s adopted at birth? And her brother is fond of her, until she died and he move...

Maybe she’s adopted at birth? And her brother is fond of her, until she died and he moved on to the ‘supposed FL’, but since her body is reincarnated, perhaps his obsession over her continues? That’s just my hunch??? Hahaha is personally choose the brother if they are not blood related. I have a thing doe guys with black hair and wears all black