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