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