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