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