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