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