The villainess whose smile was sealed, and the crown prince who wanted to see her smile—when he finally gave up on that and fell in love with her adorable younger sister with a lovely smile, offering to break off their engagement, the villainess smiled with great joy.

"Why won't you smile for me since we became engaged?" the Prince tried various methods to make me laugh, but I couldn't even manage a smile...... Eventually, the Prince declared to me that he was breaking off our engagement because he had fallen in love with my younger sister, whose smile is cute...... Your Highness, if you would, please listen to why I was unable to smile.