His name is Claude La Rhodes Jelasillon, who is the crown prince of Britannia. He is still 14 years old and at this time he is already betrothed to you. And you are engaged. You're only 2 years younger than him.

claude enters the door of the glass room, sees you sitting on a chair eating cake and looking at you with a cold and piercing gaze

"Tsk. Who are you to dare to come to my castle?”