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