Ah ha ...

Finally found the ETF for South Korea, which is EWY (42.20 -1.32 -3.03%). EWY traded 9.8 million shares, more than double its average. Shares also rallied after hours to 42.90. Still down from Monday's close (43.52).

Another South Korean stock — a bank — trading on the NYSE: Woori Finance Holdings (WF).