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