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