We can sort of see the lag between cases and deaths in the worldometers data. South Korea is therefore interesting because cases have been level for a few weeks, as have deaths. From this it looks like the death rate is about 6%. Of course it could be less if not all cases are reported or if death is attributed to the virus in "error" ("with" rather than "from"). But equally it could be higher (again distinction between "with" and "from").
Maybe I am reading it wrong but the graph of Outcome of Cases says to me the death rate is trending down from 2.88% (Apr 1 value), so likely below that level. If people take at least a month to die, then the current deaths from the chart you reference are more likely coming from the surge period when daily new cases were around 500. That would put the death rate around 1.5%, a more plausible ultimate asymptote to the Outcome of Cases chart.