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