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