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