Three people share the hotel money equally, and one person doesn't go. Do you want a refund?

Do not go back. If three people have agreed in advance to share the hotel money and have already paid it, then one of them will not go and the money he paid cannot be returned. Because travel or accommodation expenses are usually paid in one lump sum at the time of booking, if one of them doesn't go, the hotel can't return the money he has received, so the other two don't need to return his money.