To whoever uploaded "Chapter 4," please stop disrespecting the original uploader (Yukimi) by uploading over them. And to Yukimi, please don't let this rude person discourage you from uploading. Most of us here appreciate your efforts.
I believe the birthmark on her back is a sign of royalty, which is why he is trying to kill her. It seems like he's colluding with someone to take over the throne.