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