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