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