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