After Jieun asked to leave with Ayana, all the princes watched Ethan, who was still sitting silently on a chair. All the princes really wanted to know what was nestled in Ethan's mind at the time. What does he see in Jieun mind just now that even making him stiffened like that?
One of Prince Ethan's strengths is that he can read people's minds and look into their past. This ability is often used to interrogate the enemy during battle to find out the opponent's secrets or to extract important information.
Although Jieun is not a threat, but, Ethan decides to look into her mind to find out if the story being told is true. This is because he sees that the girl is too naïve for allowing herself to live in such overprotective environment resulting her not to even recognize the king and the princes of her own country. So, there must be another story behind it.