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