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