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