tourist exit record Korea tourist visa rules korea illegal work tourist korea immigration risk k-eta korea tourist medical emergency Korea travel to korea visa violation travel korea esim korea korea tourism guide missed last subway Korea late night bus Korea taxi at night Korea tourist exit procedures Korea Tax refund in Korea korea travel tips 외국인 택스 리펀 korea connectivity tourist overstay Korea consequences korea entry requirements 서울 쇼핑 환급 overstay clearance Korea overstay exit risk Korea visa free korea korea mobile internet night transportation Korea hospital visit tourist Korea Korea tax refund 공항 환급 방법 tourist entry denial korea VAT refund Korea korea sim card 한국 세금 환급 immigration overstay decision Korea Myeongdong tax kiosk