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