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