Holy, I love BL and I've always wanted to see a more grounded approach to it, especially when it's the "'straight' guy becomes gay" trope as it happens too fast in most BLs
I legitimately don't think I remember any part of the story in which the brother is bad to the ML, like their family are assholes, but it doesn't seem like the brother hates him. I may be misremembering and may need to re-read it.