help pls

manhwa, fully colored, fl is a slave working as a servant in a castle that gets invaded by the ml, she has black hair and i think the ml has blonde hair...? she defended the castle and tried to help the son of the castle's lord escape. she also escaped from another guy who collects slaves and is hinted at being a cannibal that keeps the slaves in cages suspended in air and brings one down to eat as the others watch (likely). she is politically intelligent and very reserved, ml wants her because of her beauty at first but then falls for her. she's very down-to-earth and aware of their situation. there's something about the king of the nation wanting to keep ml in check and wanting him to marry the princess and she comes to the castle and is a nasty person who bullies fl, and i think that's where i left off.