By the emperor's decree, Yerodia, the youngest daughter of a grand ducal family, is engaged to a former commoner-turned-baron. It was thought to be an unhappy marriage due to their difference in status, but at their first meeting, she falls in love at first sight!! However, he treats her like a child since she has yet to come of age… What will become of this noble lady’s love, which was supposed to be a political marriage but turned into true love?