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