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