Secretly, Greatly (Hangul: 은밀하게 위대하게; RR: Eunmilhage Widaehage) is a 2013 South Korean action comedy-drama film starring Kim Soo-hyun, Park Ki-woong, and Lee Hyun-woo, who play North Korean spies who infiltrate South Korea as a village idiot, a rock musician, and a high school student, respectively.