I was mistaken for my younger sister and told by the Crown Prince that he had become engaged to me instead, but how did this happen? Even if you consult with me about wanting to amicably break off the engagement, I'm at a loss.

I am the older sister who was told by His Highness that he mistakenly became engaged to me instead of my younger sister. How did this happen? He says it was a mistake and wants to break the engagement and become engaged to my younger sister instead—but it was *his* mistake, so how could he be so cruel? My younger sister may have a cute appearance, but she has a terrible personality and is always taking my things. Yet despite all this, if he wants to break the engagement, I've attached a certain condition to it.