work visa status e7 visa job change korea foreign worker reporting delay Korea foreign worker resignation unpaid wages foreigner Korea unpaid salary Korea foreigner labor office foreign workers Korea foreign worker job change visa reporting timing Korea part-time jobs Korea non-teaching jobs Korea foreigner jobs Seoul company closed Korea visa change job korea visa fired in Korea visa resigning job korea Saramin freelance jobs Korea foreign worker ghosted Korea XpatJobs work visa korea labor office communication Korea foreign employment law korea Korea job search guide korea employment visa work visa korea rules Korea job platforms JobKorea quitting job Korea foreigner KOTRA job fair jobs in Korea for foreigners visa sponsorship Korea work in South Korea 2025 Kowork employer shutdown foreign worker Korea foreign worker job change korea LinkedIn Korea job termination Korea foreigner English jobs Korea teaching jobs Korea expat career Korea notice period korea foreign worker unsafe work Korea labor rights foreigners Korea foreign worker mistakes Korea employer no response Korea Seoul Global Center