Uhg, even if the prince doesn't understand hooman emotions, it's not really an excuse for being a murdering psychopath. There are perfectly workable systems of ethics for (and by) people without any empathy.
Ahh it would be perfect if they fall in love with each other and then the prince found out that she's the princess he wanted to marry from the start. Isn't the reason he can't choose her as crown princess because she's only a maid?? Then this is just perfect. Marrying the person you love AND securing your empire's power through marriage.
SIR KIEL
crown prince and marie is cute but sir kiel will be alone :< sir kiel deserves a wonderful lady and i hope they give him one instead of just all the second mls being sad but supporting the fl for 'happiness' and all that jazz