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