Can I refund the difference when I book a hotel?

No, the promotion activities of the hotel will be different in different periods, and the price will also fluctuate, depending on the hotel's activities at the time of booking. If the hotel has a new discount after booking, the new preferential activities are only for newly booked orders, and hotels booked before the event cannot apply for refund of the difference. In fact, it is understandable that if the hotel activity ends and the price rises, the hotel will not ask for the possible difference.