The 27-year-old Korean pop star looks to internationalize his fanbase with ''Ninja Assassin''

By David Yi
Updated August 18, 2009 at 04:00 AM EDT

How You Might Know Him: The 27-year-old Korean pop star made a splash in the Wachowski brothers’ 2008 movie Speed Racer.
His New Film: In Ninja Assassin, he plays a deadly hitman who seeks revenge on the clan that trained him from childhood.
His Big Moment: Ninja director James McTeigue had worked on Racer and saw potential in Rain: ”His physicality is incredible.” The star worked out eight hours a day for eight months and ate strictly chicken breasts and vegetables. ”Actually, I threw up every day,” he admits. ”I was so ashamed.” Release Date November 25