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