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