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