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