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