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