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