Black Knight () is a 2023 South Korean television series written and directed by Cho Ui-seok, starring Kim Woo-bin, Song Seung-heon, Kang You-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.

Cast Main Kim Woo-bin as '5-8' A legendary delivery driver with the number 5-8. Song Seung-heon as Ryu Seok The wealthy heir to the Cheonmyeong Group who has become wealthy and powerful by controlling oxygen sales. Kang You-seok as Yoon Sa-wol Choi Seung-hoon as young Sa-wol A refugee boy who admires '5-8' and dreams of following in his footsteps as one of the Knights. Esom as Jeong Seol-ah A military intelligence officer of the Defense Intelligence Command and Sa-wol's older adoptive sister.

Supporting Kim Eui-sung as Grandpa An all-around mechanic who can fix almost anything and Sa-wol's longtime guardian. Jin Kyung as Chae Jin-kyung The President of South Korea. Nam Kyung-eup as Ryu Jae-jin The Chairman of the Cheonmyeong Group, and Ryu Seok's father. Lee Sung-wook as Oh Jin-hwan The director of Cheonmyeong Group, and Ryu Seok's assistant. Roh Yoon-seo as Jeong Seul-ah Kim Ah-hyun as young Seul-ah Seol-ah's younger sister who lives together with Sa-wol. Lee Joo-seung as Useless Sa-wol's refugee friend. Jung Eun-seong as Dummy Sa-wol's refugee friend. Lee Sang-jin as Dumb-Dumb Sa-wol's refugee friend. Kim Min as Joo Kyung-nam One of the competitors for the new Knight selection. Cho Ji-seung as Hyun Soo One of the competitors for the new Knight selection.

Cheonmyeong Group Knights Lee E-dam as '4-1' Bae Yoo-ram as '5-7' Lee Soon-won as '3-3' Heo Hyung-kyu as '1-3' Bae Myung-jin as '2-4' Yoo In-hyuk as '4-2' Jang Mi-kwan as '5-2' Yoo Hyuk-jae as '8-9' Yang Jung-doo as '8-2' Han Sang-gil as '7-3' Zo Zee-an as '6-3'

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