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