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