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