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