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