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