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