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