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