Miracle: Letters to the President (2021) Kisskh

Set in the 1980s, the film tells the story of Bo Kyung, the older sister of a math prodigy and high school student Jun Kyung. They both live in the roadless countryside of North Gyeongsang Province. With the help of his girlfriend Ra Hee, Jun Kyung works together with Bo Kyung and the village people to create a train station.