i have a feeling that it's a curse that if they love each other they'll be forced to kill each other,and after they die they'll get reincarnated and the cycle continues
so..... is the one he killed her brother or not? because he said at the end,the one he killed stole someone else's name and identity when doing something.
if it's not her brother,how does he have the same scar like she said?
if it is,what was the point of proving that the 'brother' uses...