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