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