Responses
It said Thirteenth prince, not his age. He has many siblings. He also said that princes who are 10th above (including him) doesn't have any attendants that's why he doesn't have one, thus also adding to proof that that's not his age but his place as the prince back in his country. His age (18) and Seme's (10) was clearly stated in their character reference sheet.
guys i wanna read this but im uncomfortable w the male lead being a child can somebody explain this to me