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