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