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