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