Do I have to come back for a group tour?

You're right. You must come back with the group when you go out with it. It is written in the contract you signed with the travel agency before departure, especially for outbound travel, especially to Europe and America. When we travel to Europe and America, we have to pay a deposit to the travel agency. That is, if you don't travel with a group abroad, you will run away, and this deposit will be confiscated and does not belong to you, so you must travel with a group. .