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