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