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