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