Where was The Tale of Nokdu filmed?
2019 South Korean television series
Wikidata records no filming location for The Tale of Nokdu (2019–) at all, not a place, not even a country. There is nothing to pin, and this page says so rather than guessing.
Why there is no pin
Its Wikipedia article also says it was filmed in Gangwon Province, Pyeongchang County, without naming a place, so it is not on the map.
Filming locations that are mapped there: South Korea