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