If you stay in Thailand and want to go home but want to come back again, you must apply for a re-entry permit.（5000 THB）
Several friends boarded the plane and asked me if they could apply for a re-entry permit in China. Of course not. The visa will be automatically cancelled.
The appliicant must go together to the immigrration Bureau and apply for a re-entry permit, whether it is in Bangkok Immigration Bureau or Samutprakarn Immigration Bureau.