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