foreign worker job change korea KOTRA job fair unpaid salary Korea foreigner visa reporting timing Korea foreign worker mistakes Korea foreign worker job change work visa korea rules foreign worker unsafe work Korea part-time jobs Korea non-teaching jobs Korea fired in Korea visa foreign worker resignation resigning job korea Korea job search guide work visa korea work visa status quitting job Korea foreigner labor office foreign workers Korea foreign worker reporting delay Korea unpaid wages foreigner Korea labor office communication Korea korea employment visa JobKorea teaching jobs Korea LinkedIn Korea XpatJobs foreign employment law korea Korea job platforms expat career Korea work in South Korea 2025 foreign worker ghosted Korea visa sponsorship Korea English jobs Korea notice period korea e7 visa job change korea foreigner jobs Seoul Kowork company closed Korea visa labor rights foreigners Korea Seoul Global Center employer no response Korea employer shutdown foreign worker Korea change job korea visa jobs in Korea for foreigners freelance jobs Korea Saramin job termination Korea foreigner