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