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