It's more like a love story between the two. They fight all the time that the king/ex hero fell for her but she didn't love him back gave birth to the new demon king. He stole her and kept her captive. He's a creepy stalker. "If I can't have you, I'll have you close in captivity."
I suspected him from the beginning. Why he getting upset when he has a child too. Unless, he sold his child and the children to some bandits. Or something.
You think you're so special. Trying to exclude me by speaking a different language?? HAH! Try me bitch! I bet I can beat you in tennis too and I speak better french you fake ass bitch. You slut trying to seduce someone's husband. (╬ ̄皿 ̄)凸
...to knock. ┑( ̄Д  ̄)┍