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