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