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