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