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