This is one of those series that I find it really hard too like anyone, sure I can sympathize with several characters but I'm not a huge fan of any of them. The main character isn't trying to become a better person she just doesn't want to end up the same position. Her sister isn't naive she is choosing to be ignorant a little common sense and she should understand her family situation. Yulan is a bit possessive or maybe defensive but as long as it doesn't go too far his character is salvageable. As for the prince he is literally ordering his servant to fuck over his half brother to get a girl who isn't paying attention to him anymore. Fuck Him! I vote nunnery