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