Sejong is still a new city to be fair. Also, there is not much jobs there so far, except for civil servants. But the worst crime of all in creating that new city is that public transport is lacking! How could city planners have that oversight! There is more info from Caspian Report about the Sejong city.
A company headquartered in a tax-haven and laissez faire city state should give hint that bottomline is more important than humans. Always have contingencies when it comes to career, because you never know when your employer might conduct “layoffs”.