How would he? He's banned from travel, likely doesn't have his passport in his possession, and where would he go?
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He can't go north, that's a heavily guarded border. Fleeing to Japan even if he could get a boat wouldn't accomplish anything other than ending up sent right back. China actually enforces their borders unlike some western countries so that's not going to work. And he doesn't have the money to be able to pay anyone to smuggle him out anyway and it isn't like he can swim the 100+ miles to Japan who again would probably just send him right back.