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