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