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