Refers to the room where the guest has reserved a ktv room but has not yet entered the use.

The outer room is generally a preferential room made by merchants in order to attract customers. If it is booked by the guests, it will be gone.

For example, when you stay in a hotel, other expenses during your stay, such as going to the hotel restaurant to eat and paying the bill with the restaurant, if the hotel has this service. Then you can wait until the final settlement.