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