Cause he was emotionally abusing her? He also physically abused her to
Who's sou? Which manga are we talking about? i can't see
Oh sorry! Got it now.
Wasn't he good? He was the angel twin no? She killed the evil twin or did she?
He may have been the angel twin, but he still encouraged the abuse she endured, if not entirely at least initially. He was only an angel in comparison to his shitty brother.
Wait why did she kill sou?