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