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