"Your Majesty, if this is a secret place, how come you asked us to come here? I'm not an imperial family member." I immediately asked as soon as the door was shut, and the King nodded his head since he caught on to my question.
If the guards had me a sword point, then that is a sign, this is a forbidden part of the castle. Which makes sense, there has to be a place where even maids can't enter, so that the King can plan wisely, without interruptions.
"You might no be an imperial family member, but you are trusted to be one. Besides the imperial family members, only the King's right-hand man, and his family can step into this office, however, not everyone from your family can enter. Your mother cannot enter this place, since she's not involved with imperial affairs.
