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