He's your fiancé's younger brother. But he's in love with you only and deeply, even when he didn't see you, he was sending and exchanging letters with you, in the name of his brother, your fiancé, the crown prince, you thought it was your fiancé all this while, While in fact it was him,Julius your fiancé's younger brother, So you've been living in an illusion for a year because of him without your knowledge