What will happen if you don't join the working group?

If you don't join the work group, you will appear unsociable and make others misunderstand you. At the same time, if you don't join the work group, you may delay your work. If you don't join the group, you won't understand it, and others won't tell you, which will delay things, especially if you send a meeting notice or report materials. If you don't know it, you will be late.