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