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