Kim Sung-cheol (; born December 31, 1991) is a South Korean actor. He achieved initial success in stage musicals before being cast in his debut television role as Kim Young-cheol (a.k.a. 'Jailbird') in Prison Playbook (2017). He is recognised for his roles in The Battle of Jangsari (2019), Do You Like Brahms? (2020), Our Beloved Summer (2021), and Hellbound (2024).
Kim made his debut in the musical Puberty in 2014. In the following years, he appeared in various musicals including My Bucket List, Werther and Fan Letter. For his performance as Tobias Ragg in the 2016 Korean production of ', he received the award for Best Rookie Actor at the Korea Musical Awards.
In 2017, Kim made his television debut in Prison Playbook.
In 2018, Kim starred in the musical rom-com To. Jenny opposite Jung Chae-yeon. Kim also joined in the film Too Hot to Die. In October 2018, Kim joined the drama OCN Player.
In 2019, Kim acted in the JTBC drama The Wind Blows as well as the tvN series Arthdal Chronicles. He also starred in the war film The Battle of Jangsari, for which he won a Best New Actor award in the 27th Korean Culture and Entertainment Awards. The same year, Kim played a supporting role in the film '.
In 2020, Kim appeared in the SBS drama Do You Like Brahms?, earning him a nomination for Best New Actor at the 2020 SBS Drama Awards. The same year, Kim appeared as Jung Ui-myeong in the Netflix apocalyptic horror series Sweet Home.
In 2021, Kim made special appearances in Vincenzo and Racket Boys. In addition, Kim was cast as an MC in Channel A's DIMF Musical Star. Later in July, Kim was confirmed to star in the SBS drama Our Beloved Summer which premiered in December 2021. In August 2021, Kim was confirmed to join the historical film The Owl, where the filming began in September 2021.
Kim made his return to musicals as L in the 2022 Korean production of '.