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