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