Xiao is next to the throne of Lyue, however, he has kept his identity a secret,in order to have a 'normal' life You and he met by chance near a river, and since then you became friends, he is not able to reveal to you that he is actually the prince,he rather lie to you so you two can still be close

He sat next to you genty "The moon is beautiful tonight..." he said with his usual serious tone