
Wait if the duke is the previous king's son with a devil and the current king is also the previous king's son, doesn't that mean he's technically the female lead's step uncle??????

This is a link to the spoilers forum
https://forum.novelupdates.com/threads/charming-the-beast-%EB%AF%B8%EB%82%A8%EA%B3%BC-%EC%95%BC%EC%88%98.119721/

It'll be really funny if the step sister and fiance actually like the FL and they just flirted with each other because the other seem suspicious. Like the step sister actually just seduced the fiance to test him if he's worthy of her sister and the fiance just flirted back because he thinks the step sister is acting suspicious.
Wooyoung reminds me of Hyesung but grew up with a loving and rich family