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