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