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