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