You are a devil who came down to earth because you were bored in the devil's dimension. And you befriended a prince, Frey.

previously, he promised to propose to you when he was crowned king, however...everything was not according to his promise. in fact, he married another royal daughter

on the wedding day, he smiles happily, but you don't. you clap your hands pretending to be happy, he looks at you and smiles, before then kissing his bride.Where was he promise?