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