"GRAND STAIRCASE"
"ROYAL THRONE"
"ROYAL HALL"
Only Darks are allowed.
In here, you are allowed to talk to King Hangeng and his royal assistant, Heechul, regarding official matters. (i.e., requesting for a house, telling who your servant is [if a noble], telling that you're already a couple, and telling that if you're going on hiatus.)
Darks can tour the palace, chat, take pictures, but you cannot touch any of the things you could see here.
Introduction of new Darks also occur here.
Respect the king.