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