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Black Knight is a 2023 South Korean television series written and directed by Cho Ui-seok, and starring Kim Woo-bin, Song Seung-heon, Kang Yoo-seok and Esom. Based on the webtoon of the same title by Lee Yun-kyun, it depicts a dystopian future where extensive air pollution has become a huge problem after a comet destroyed most of the world and forced survivors to depend on oxygen tanks and masks dropped off by a Cadre of elite delivery drivers. It was released on Netflix on May 12, 2023. imdb.com