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