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