Landscapes & nature
Udo
Island in Jeju-do, South Korea
Wikipedia names Udo as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Udo. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities Udo-myeon
South Korea · under 1 km
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Landscapes & nature
Dongbaekdongsan Wetland
South Korea · 22 km west
Wetland in the Jeju-do province, South Korea
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Landmarks & buildings
Jeju Stone Park
South Korea · 28 km west
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Towns & cities
Namwon
South Korea · 34 km south-west
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Towns & cities
Ara-dong
South Korea · 38 km west
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Towns & cities
Ido 2(i) Dong
South Korea · 39 km west