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