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