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