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