The movie [Soldier Blue] featured in Choi In-hun's novel

‌In [A Day in the Life of Kubo the Novelist], the protagonist and his friend
ate Wandang near the Sejong-ro Civic Center,
took a taxi to the theater to watch it, and then had a serious discussion about it.
It was a controversial film depicting the massacre of Native Americans by the US Cavalry;
while it failed at the box office in the US following much controversy,
it was released in Korea in 1971 (with many scenes deleted)
and reportedly "recorded 177,000 viewers in Seoul, ranking 4th in foreign film box office hits."
The female protagonist Candice Bergen

I heard she also appeared in [Sex and the City]