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