Scarlet Innocence (2014) on Netflix

Plot summary

Shim Hak-kyu teaches literature at a university in Seoul. A sex scandal forces him from the city, and until the matter is settled he takes a teaching post in a small rural town, where Deokee, twenty years old, sells tickets at an amusement park. Her quiet life changes when he moves in, and the attraction between them becomes an affair that the townspeople talk about and that disturbs Deokee's deaf mother. When the fall semester begins, Hak-kyu goes back to his family in the city. Deokee will not let the affair end, and the promise he made to return keeps her waiting in the town.