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