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