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