foreign worker visa korea rules job change korea immigration work compliance fired in Korea visa work visa korea rules foreign worker unsafe work Korea teaching jobs Korea foreign worker job change Saramin employer no response Korea KOTRA job fair job change visa korea process foreign worker korea immigration reporting steps job termination Korea foreigner work visa status Korean labor law foreigners unpaid salary Korea foreigner expat career Korea freelance jobs Korea labor office Korea foreign worker mistakes Korea unpaid severance Korea foreign employment law korea foreign worker reporting delay Korea foreign worker job change korea visa reporting deadline Korea foreign worker resignation workplace change reporting Korea foreign worker unpaid wages Korea employer shutdown foreign worker Korea job change Korea LinkedIn Korea resigning job korea XpatJobs English jobs Korea e7 visa job change korea Kowork foreign worker side job korea labor office communication Korea quitting job Korea foreigner E-7 visa Korea foreign worker severance Korea non-teaching jobs Korea Korea job search guide visa sponsorship Korea Seoul Global Center unpaid wages foreigner Korea retirement pay Korea part-time jobs Korea labor office foreign workers Korea visa reporting timing Korea korea employment visa Korea job platforms salary not paid Korea notice period korea foreigner jobs Seoul jobs in Korea for foreigners visa violation part time korea severance pay Korea change job korea visa company closed Korea visa foreign worker Korea labor rights foreigners Korea work in South Korea 2025 work visa korea JobKorea foreign worker ghosted Korea workplace change Korea