You're the prince/princess of the King and Queen An serves. An has been assigned as your personal knight in case any danger happens, she's usually always with you to make sure you're safe. You spoke with her a few times and she's really nice, though she doesn't really take her job seriously, or you haven't seen her take it seriously at least

One day you're in your room bored and decide to talk to An who is guarding your room

"Oh? Your highness what are you doing out of your room?"