劉亞仁
Resuming his acting career, Yoo starred in low-budget indie film "Boys of Tomorrow", taking over the role of a young man Jong-dae, who carries the psychological scars of a traumatic childhood accident. The film premiered at Busan International Film Festival in October 2006, and competed for the Golden Leopard at the 2007 Locarno International Film Festival. He said about the meaning of his first film, "If I have drawn a picture of the actor career, this film must be within that picture." Director Noh Dong-seok met Yoo when he couldn't make up his mind even though he has met several actors interested in the role of Jong-dae. Noh decided to cast Yoo within five minutes of meeting him, saying, "I can't forget the first five minutes I met Yoo at the audition. When I asked other actors about Jong-dae character, they usually answered, 'I think he's going to wear something, have some hairstyle and some kind of personality'. But he stared out the window for a long time, and suddenly said one word as if he choked up slightly, 'It's sad.' At that moment, I thought, 'Jong-dae is him.'" During the film's press junket, Noh said, "In contrast to his noticeably good looks, he was filled with a furious energy. When I hear the word ‘youth,’ I think of Yoo Ah-in. The true main character of this movie, I think, is [not Jong-dae but] Yoo Ah-in." Noh also recalled Yoo's audition in an interview, saying, "I fell for Yoo Ah-in at first sight. Of course, he also had good looks. But he had an extremely different feel from the other actors whom I had met during casting. Yoo Ah-in was nervous when he met me. Before his identity as an actor, he possessed twenty years of his natural self as Yoo Ah-in." Yoo's role as a boy looking for a gun in order to escape from his frustrating reality earned positive reviews, and he won the Best New Actor award at the Busan Film Critics Awards. Yoo then starred in Jeong Yoon-cheol’s black comedy film "Skeletons in the Closet", playing the role of a eccentric boy who believes he was a king in previous incarnation. Yoo was nominated at the Blue Dragon Film Awards.