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