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