I agree that your opening line is great but that it does need to be changed. For me, other than learning MC has the ability to learn names, her work place doesn't tell us much versus the scene with her family. Which tells us alot! Also, was I the only who missed that C while the characters around the MC aren't human, I don't have a description of her as human or not? If I missed it sorry.
And as a fan of history, I find it hard to believe there would be rebels to a new ruler when they don't like their old one "whether he treats Pem....was conquered.” In most cases their indifferent (because the war ended) or they favored one side to win (or had hoped for another monarchy to move in). Also, I find that major changes in ruling only happen when there is no other choice or when a monarchy loses control of its land/population (think USA revolutionary war, French Revolutionary war etc). So far, we have only heard that the BK is ambitious, but nothing about his people, where they came from, their culture or how they rule. If the BK took over and then his people were forcing new cultures or religion, I can see an uproar, but in the first chapter I don't see a need to join the rebels and leave your children parentless other than the other king lost and the sister doesn't like change.