A Right One

In Agost's chamber,

The royal physicians took care of Agost's every wound. While doing so, they poured a magical solution on the crescent mark once they sent Cyrus away. If Agost had painted the crescent, it would wash off but the crescent stayed as if it was etched in his body below the skin. 

A junior physician pretended to be surprised while passing the herb paste to the chief physicians, "Prince Agost, from when do you have the crescent mark?"

Agost flinched when he felt his wound churn due to the application of medicine. Cyrus responded, bringing a white cotton gauge, "His Highness has the mark from his childhood." Hence he always thought Agost was returning to Anka for Princess Freya as Alora was said to be dead.

Agost wasn't answerable to the physicians so he ignored them and their conversation while sitting on the bed, waiting for his wounds to get treated.