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