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