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