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