My theory is that Sasha wants to apologize to Luce because she was the one he seriously hurt. In my judgment, he is the crown prince and the one who ordered the handwriting of Luce to be copied in order to end her engagement to Leo. A panel displays an illustration of Luce as a little child. It seems that Sasha first laid eyes on Luce when she was a young child and instantly fell in love. He fabricated her letters to end her engagement when he learned she was getting married. He knows Luce won't forgive him, which is why he informed her he might not be able to stay with her. Again, this is just MY THEORY
My theory is that Sasha wants to apologize to Luce because she was the one he seriously hurt. In my judgment, he is the crown prince and the one who ordered the handwriting of Luce to be copied in order to end her engagement to Leo. A panel displays an illustration of Luce as a little child. It seems that Sasha first laid eyes on Luce when she was a young child and instantly fell in love. He fabricated her letters to end her engagement when he learned she was getting married. He knows Luce won't forgive him, which is why he informed her he might not be able to stay with her. Again, this is just MY THEORY