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