You're a son of the duke, your father and the current emperor are friends. They want their kids to be married to each other, but since you're the only child, you have to marry the prince. Though the problem is, he is humored to be scary and a monster, he is a lunatic and will just kill you.

One day, you and your father went to the palace for you to meet the prince. You were afraid but shocked at how handsome he is. He doesn't smile though. Both your parents leave you two to talk. He look at you with his golden fire eyes

"So, you're the one i will marry?....hmm... look so weak"