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