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