uwuzer
I don't think you made Miwen overly edgy here, it makes sense for the anger and other emotions that came out when he heard his sister, his greatest emotional support, was nearly killed for selfish reasons. That would harden anyone's heart a bit and make them more intense than normal, bringing out aggression and hatred that is not often felt or expressed. Obviously it would be bad if Miwen kept getting edgier and edgier, but if this is as bad as it gets for now then no problem. Also, please don't kill off his sister for Miwen's character development. I don't know her enough to care much about her as a character I just don't want to see Miwen suffer so much. If there HAS to be tragedy to drive the story, kill off his parents at some point. Not that I'm fond of that idea either, it's just a better alternative.