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