Warning: Do Not Play (2019) on Netflix

Plot summary

Park Mi-jung, a rookie director, has spent eight years preparing a horror film and wants to make her next one. She hears about a movie that was banned: a horror picture Kim Jae-hyun directed eight years earlier. A legend has grown around it that a ghost made the film, and Mi-jung decides to learn what happened back then, thinking it might inspire her own work. She begins tracking the movie down, and her search leads her to Jae-hyun, who tells her to forget his film. She ignores the warning and keeps looking for it, at risk to her own life.