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