In 2012, Yoo was cast in his first role as a leading man in Operation Proposal, a Korean remake of the Japanese drama Proposal Daisakusen. He then co-starred with Kim Ha-neul in the thriller Blind. He also voiced Greenie, Leafie's adopted son, on Leafie, a Hen into the Wild, which was adapted from a bestselling children's novel by Hwang Sun-mi. In 2011, Yoo trained in swordplay and martial arts in his role as an assassin in Warrior Baek Dong-soo, an action-period drama based on the manhwa by Lee Jae-heon. The song's lyrics was based on a diary that Yoo had written while seeing orphans of war in the slums of Sri Lanka. Later that year, Yoo sang a duet with singer/actress IU titled 'Believe in Love' for the charity program Love Request. He then played a more mature role in Flames of Desire, as the second-generation son of a wealthy chaebol family who is uninterested in the battles of succession among his relatives and becomes a married man at 21. In his teens, Yoo was cast in one of the major roles in Master of Study (2010), a Korean screen adaptation of Japanese manga Dragon Zakura. He also played Kim Chunchu in the period epic Queen Seondeok. In 2009, Yoo starred in the action film City of Fathers and thriller film 4th Period Mystery. 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). He continued acting in television, appearing in Magic Warriors Mir & Gaon (2005), an adventure series for children. Thereafter, Yoo also starred in animal movie Hearty Paws (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 was then affectionately labeled as ' Nation's Little Brother'. The low-budget film was a surprise box office hit in 2002, drawing more than 4 million admissions. 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. In 2000 Yoo began his career as a child actor, first appearing in the television drama Daddy Fish. 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. Career 1999–2009: Beginnings as a child actor He decided not to pursue a college degree in order to concentrate on his acting career. Yoo graduated from Baekshin High School in February 2012.

2.3 2015–present: Adult roles and rising popularityīorn and raised in Incheon, Yoo is the younger of two siblings, he later claimed that his family had been poor.2.1 1999–2009: Beginnings as a child actor.

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