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