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