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