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During a live discussion with Costa-Gavras at the 2019 Busan International Film Festival, Park told audiences that he was still working on his adaptation of Westlake's novel. The film was described by Park as a "lifetime project" and that while he hadn't begun filming it yet, he wished "to make this film as my masterpiece." Gavras, who still held the rights to the book, had helped Park to develop the project. The film was set to be an English-language picture, with Don McKellar co-writing the script alongside Park.

Remake of Cacciatore di teste (2005)