Where was Detective K: Secret of the Virtuous Widow filmed?
Wikidata records no filming location for Detective K: Secret of the Virtuous Widow (2011) at all, not a place, not even a country. There is nothing to pin, and this page says so rather than guessing.
From published sources
Places named by newspapers, film offices, archives and city filming permits. Each source is linked.
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Towns & cities
Hansu-myeon
South Korea
Film archive record: 월악산국립공원, 충청북도 제천시 한수면 송계리 월악산국립공원 Korean Film Archive
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Landscapes & nature
Geogeumdo
South Korea
Film archive record: 거금도, 전라남도 고흥군 금산면 신평리 거금도 Korean Film Archive