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