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