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