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