Streets & squares
Gwanghwamun Plaza
Public open space in Downtown Seoul
Wikipedia names Gwanghwamun Plaza as where 4 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 Gwanghwamun Plaza. 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 Gwanghwamun Plaza. Each source is linked.
Filming locations nearby
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Landmarks & buildings
Sejong Center
South Korea · under 1 km
Arts centre in Seoul, South Korea
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Landmarks & buildings
Gwanghwamun Station
South Korea · under 1 km
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Towns & cities
Jongno District
South Korea · under 1 km
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Towns & cities
Dangju-dong
South Korea · under 1 km
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Landmarks & buildings
Ilmin Museum of Art
South Korea · under 1 km
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Towns & cities
Cheongjin-dong
South Korea · under 1 km