Background In April 2019,
Studio N (the production company subsidiary of
Naver Webtoon), confirmed that a film adaptation of the
Brave Citizen webtoon was going to be made. The webtoon's creator, Kim Jung-Hyun, was inspired to create the concept for the story from an article he read about a teacher who ignored school violence. The article prompted him to think about how a teacher in that situation would react if they themselves became the victim of bullying. The film's director,
Park Jin-pyo, stated that he worked on developing the theme of school violence from the webtoon into the film two and a half years prior to the phenomenon's renewed attention in South Korea, which occurred prior to the film's release in 2023.
Casting On October 9, 2021,
Shin Hye-sun was reported to be positively responding to the script after having been offered a role in the film. On November 12, 2021, Studio N announced that Shin and
Lee Jun-young had been cast in the leading roles. Shin trained for 6 months with a martial arts instructor for her character, and confirmed she performed all the action scenes in the film herself. The film is Shin's first action film.
Filming In August 2021, it was reported that filming would begin in November of that year. However, later reports in November 2021 indicated that filming would begin in December 2021. Heo Myeong-haeng, known for being an action direction master choreographed the action sequences for the film.
Post-production Deadline reported that South Korean sales company Finecut had acquired the international rights to the adaptation at
Busan International Film Festival's Asian Film & Contents Market that took place in October 2022. == Release ==