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