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