Responses
I'm pretty sure the brother doesn't actually r*** her, but if my memory doesn't fail me (since it's been a long time) he doesn't stop using underhanded means to control and own her until the end (cueing sh, sa, etc) . Nearing the end, he doesn't go unscath, but he did think (till the end) that if they weren't blood related siblings, they would have been together.
Judging from the other comments so far plus the bad vibes creeper bro and his minion are giving, I'm scared about what's gonna happen in the next chapter. Someone pls spoil it for me bc I wanna brace myself (⊙…⊙ )