Responses
Hm...
He didn’t fell in love that fast...
I am pretty sure he already like her even ever since before the current soul reside on this body...
In the life before, the girl has always chosen the Hero no matter what happened.
But somehow in this life, she is rejecting the hero and she behave a bit differently than her before.
So the Demon King decided to take this chance to approach her.
.....
I don’t know if I explained that properly or not... sorry, you might need someone else to explain this in more detail...

It kinda annoys me how quickly he fell in love, just as demon king it doesn’t seem too realistic. But whatever. What makes me mad about him isn’t him lying to her but actually all tht useless work he gives her, gosh if my man did that I would be so pissed. It would make me feel humiliated and worthless, like they think I’m stupid