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