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