Baum-sik Jeong believes that although the pseudo-documentary horror film initiated by "Blair the Witch" has undergone continuous exploration, it is limited to the adaptation of the theme and the form has not broken through. He hopes to be innovative and decides to adopt " The "immersion" method creates a horrible effect. He went online and saw that the racing video uploaded by car fans received huge advertising fees, and he had the inspiration for live video. That is, the timeline of the movie is almost the same as in real life, with the start of live broadcast and the end of live broadcast. "The password is over. After deciding to adopt this method, the performances, lines, and positions of the photographers and actors in traditional movies have little meaning, so he simply asked the actors to carry various cameras to shoot.
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From the initial planning to the marketing of the film, young audiences aged 10-30 are the main target audience. The goal of the announcement is to attract young people who are more willing to play mobile phones in a comfortable place than sitting in a theater for two hours. Director Baum-sik Jeong discovered from his teenage son that young audiences are not watching horror movies, but enjoying horror movies. That is to say, watching horror movies is like playing games. He believes that only by creating a "game" feeling and making young audiences look forward to the process of watching a movie can they put down their phones and enter the theater. Therefore, he completely abandoned the in-depth display of "grief" in the previous Korean horror films, and instead produced "experiential" horror films, removing all stories unrelated to the live broadcast
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