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