Landscapes & nature
Mungyeong Saejae
Mountain pass
Wikipedia names Mungyeong Saejae as where 3 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 Mungyeong Saejae. 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 Mungyeong Saejae. Each source is linked.
Filming locations nearby
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Towns & cities
Mungyeong-eup
South Korea · 5 km east
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Towns & cities
Suanbo-myeon
South Korea · 9 km north-west
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Towns & cities
Gaeun
South Korea · 13 km south
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Landmarks & buildings
Kimryongsa Temple
South Korea · 14 km east
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Towns & cities
Hansu-myeon
South Korea · 15 km north
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Towns & cities
Chilseong-myeon
South Korea · 17 km west