Castles & palaces
Changdeokgung
Palace in Seoul, South Korea
Wikipedia names Changdeokgung as where 1 film or series was filmed; its 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 Changdeokgung. 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 Changdeokgung. Each source is linked.
Filming locations nearby
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Towns & cities Gahoe-dong
South Korea · under 1 km
Administrative division in Jongno-gu, Seoul
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Landmarks & buildings
Rakkojae
South Korea · under 1 km
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Landmarks & buildings
Jongmyo
South Korea · under 1 km
Royal Confucian shrine in Seoul, South Korea
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Castles & palaces Unhyeongung
South Korea · under 1 km
Palace of Joseon and Korean Empire
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Landmarks & buildings Choongang High School
South Korea · under 1 km
High school in Jongno District, Seoul, South Korea
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Landmarks & buildings
Baek Inje House
South Korea · under 1 km
Building in Jongno District, South Korea