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