korea employment visa foreign worker visa korea rules job change korea immigration work compliance unpaid wages foreigner Korea work in South Korea 2025 unpaid salary Korea foreigner foreign worker mistakes Korea jobs in Korea for foreigners freelance jobs Korea notice period korea work visa status foreign worker side job korea Seoul Global Center visa reporting timing Korea employer no response Korea foreign worker resignation English jobs Korea foreign worker job change korea salary not paid Korea labor rights foreigners Korea foreigner jobs Seoul labor office Korea workplace change reporting Korea foreign worker JobKorea LinkedIn Korea foreign worker reporting delay Korea labor office communication Korea labor office foreign workers Korea Korea job search guide visa sponsorship Korea fired in Korea visa foreign worker ghosted Korea work visa korea Korea job platforms job change visa korea process foreign worker korea immigration reporting steps part-time jobs Korea e7 visa job change korea Kowork E-7 visa Korea foreign employment law korea Korean labor law foreigners foreign worker unsafe work Korea expat career Korea retirement pay Korea severance pay Korea change job korea visa visa reporting deadline Korea teaching jobs Korea visa violation part time korea XpatJobs non-teaching jobs Korea unpaid severance Korea job change Korea Saramin resigning job korea foreign worker job change quitting job Korea foreigner job termination Korea foreigner work visa korea rules employer shutdown foreign worker Korea company closed Korea visa KOTRA job fair unpaid wages Korea workplace change Korea foreign worker Korea foreign worker severance Korea