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