Castles & palaces
Deoksugung
Palace
Wikipedia names Deoksugung 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 Deoksugung. 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 Deoksugung. Each source is linked.
Filming locations nearby
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Towns & cities
Jeong-dong
South Korea · under 1 km
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Towns & cities
Seoul Capital Area
South Korea · under 1 km
Region of South Korea
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Landmarks & buildings Seoul Finance Center
South Korea · under 1 km
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Landscapes & nature
Cheonggyecheon
South Korea · under 1 km
Stream in Seoul, South Korea
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Streets & squares
Cheonggye Plaza
South Korea · under 1 km
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Towns & cities
Sinmunno 1-ga
South Korea · under 1 km