i'm pretty sure i've heard of this idioms somewhere "Like a dog who spits and lick it back.", Literally means a person who throws smth away and begs for it again- Complete definition of the duke.
This god damn it younger sister! Does she even know how much that country suffer because of her actions?! Doesn't even listen to reasons! Same goes with every single character inside this Manhua! Even the MOBs (except for the king)
Bet the younger sister is kind just she really is not reliable( and doesn't care about the country since she'd rather commit suicide than helping the country's economy to improve), plus, if she sees the duke's face once, she might even be head over heels for him.