Kyung-nok Chun reports on how a strike by rail workers shook the country's rightwing president and altered the political landscape.
The 23-day strike by the South Korean railway union that ended on 31 December was by far the most serious challenge to Park Geun-hye, whose election as president a year ago sowed horror among many worker activists and the left.
The strike was the lightning rod for the anger of everyone disgusted by Park - the former dictator's daughter. It was a battle fought on behalf of the entire working class. And though the outcome fell short of a victory, it left in its wake fertile ground for future struggles to develop.