Castles & palaces
Gyeongbokgung
Palace in Seoul, South Korea
Wikipedia names Gyeongbokgung as where 2 films and series were filmed; each title’s page links to the sentence that says so. Wikidata records no shoot here yet. Newspapers, film offices and archives name more, listed below.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Gyeongbokgung. Each title’s page links to the sentence that says so.
From published sources
Newspapers, film offices, archives and city filming permits say these were filmed at Gyeongbokgung. Each source is linked.
Filming locations nearby
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Landmarks & buildings
National Museum of Modern and Contemporary Art, Seoul
South Korea · under 1 km
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Landmarks & buildings
Gwanghwamun
South Korea · under 1 km
Main gate of Geongbokgung Palace (also known as Kyŏngbokkung Palace)
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Towns & cities Changseong-dong
South Korea · under 1 km
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Landmarks & buildings
Gyeongbokgung Station
South Korea · under 1 km
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Towns & cities
Tongin-dong
South Korea · under 1 km
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Towns & cities
Samcheong-dong
South Korea · under 1 km