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