I have become the develish prince's fiance

Isabela is an orphan who is just trying to survive in her town at the kingdom of Mellofecya until one day when them highness are coming to visit the Duke of Lominya and interrupt her kind of piece full life, unfortunately Isabela get into an agreement with his highness which involved her into being engaged to him.

while Isabela is trying to escape from this agreement alive she finds secrets about the Royal family and the prince himself.