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