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