local office notices foreigners Korea address registration foreigner Korea address reporting korea foreigner health insurance bill Korea ARC bank account Korea expat tax risk Korea billing error foreigners Korea job loss mistakes Korea foreigner bank account Korea foreigner healthcare Korea foreign resident bills korea overpay insurance utilities korea fix billing HiKorea address report ARC address change NHIS Korea foreign residents foreign resident Korea Korean bank account health insurance foreigners korea address registration risk Korea national health insurance korea foreigners foreign resident fine korea foreign resident bills Korea living in Korea foreign resident tax Korea local office foreigners Korea address change Korea insurance after unemployment Korea mobile banking Korea housing problems after job loss Korea dependent insurance Korea moving in Korea