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