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