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