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