FUUUUUUUUUCK's Manga

I don't like the FL at all , she knows her brother is being abused yet she doesn't even try to gix things a little , the fact that the ML even likes her surprises me ,for a child his age ,who was never given any luck ve to see his father obsessed with this random kid that one day came by , a normal kid would be jealous and hates her for it , he's such a good kid but she's the FL for god's sake she should be making changes and sticking up for her "bias".