Yoo Seung-ho (born August 17, 1993) is a South Korean actor who rose to fame as a child actor in the film The Way Home (2002). After his two-year mandatory military service, he starred in the legal drama Remember (2015), historical films The Magician (2015) and Seondal: The Man Who Sells the River (2016) as well as historical drama The Emperor: Owner of the Mask (2017) and romance comedy series I'm Not a Robot (2017). Born and raised in Incheon, Yoo is the youngest of two siblings, he later claimed that his family had been poor. Yoo graduated from Baekshin High School in February 2012. He decided not to pursue a college degree in order to concentrate on his acting career. Yoo made his entertainment debut in a cellphone commercial in 1999 after Yoo's mother sent in a photo of her son to an ad agency. In 2000 Yoo began his career as a child actor, first appearing in the television drama Daddy Fish. He rose to stardom in his first film The Way Home, playing a bratty city boy who learns to appreciate country life when he's forced to spend the summer with his deaf-mute grandmother. The low-budget film was a surprise box office hit in 2002, drawing more than 4 million admissions. He was then affectionately labeled as "Nation's Little Brother". Thereafter, Yoo also starred in animal movie Heart Is... (2006) about a boy and his beloved dog, and Unforgettable (2008) about school children from a remote island who go on a field trip to a candy factory in Seoul during the 1970s. He continued acting in television, appearing in Magic Warriors Mir & Gaon (2005), an adventure series for children. Yoo further built his filmography, playing younger counterparts of male protagonists in television dramas, including general Yi Sun-sin in Immortal Admiral Yi Sun-sin (2004), King Seongjong in The King and I (2007), and Gwanggaeto the Great in The Legend (2007). In 2009, Yoo starred in the action film City of Fathers and thriller film 4th Period Mystery. He also played Kim Chunchu in the period epic Queen Seondeok As his first post-army project, Yoo appeared in the music video for Naul's "You From the Same Time" in 2015. He was next cast as a stubborn webcomic writer raising a cat in the TV adaptation of webtoon Imaginary Cat. Yoo followed this by starring in the joseon-era romance film The Magician directed by Kim Dae-seung, in which he plays a circus magician who falls in love with a princess. Yoo was then cast in SBS's legal thriller series Remember as a lawyer with hyperthymesia who defends his father on death row. In 2016, Yoo starred in the historical comedy film Seondal: The Man Who Sells the River as the titular character Kim Seon-dal. In 2017, he starred in MBC's historical melodrama The Emperor: Owner of the Mask and romantic-comedy I’m Not a Robot. In 2018, he was cast in SBS's high school drama My Strange Hero. Yoo enlisted for his mandatory military service, as a regular soldier, on March 5, 2013, where he reportedly worked training new recruits. He was discharged on December 4, 2014.

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