Han-gu was born to a Pilipino father and a Korean mother. His dream is to become a national Taekwondo athlete, and he's usually very bright and cheerful. His girlfriend Mi-su always encourages his dream. Maybe his dream was too fantastical; he always fails to make it to the final round, and it's not just because of his talent. However, Han-gu doesn't give up and doesn't show any sign of exhaustion. He challenges himself to become a national Taekwondo athlete for the sake of his family and his girlfriend. Can he become a national Taekwondo athlete?

Based on a true story and a legendary Korean novel, this movie follows Detective Oh (superstar Lee Jung Jae) and his investigation into the mysterious murder of a North Korean. His investigation leads him to a diary, which was written by a nun who - along with her boyfriend - helped lead the escape of North Korean POWs held captive during the Korean War. Detective Oh eventually becomes emotionally involved with the case and pursues the writer of the diary and her long-lost boyfriend, hoping to crack the case and learn more about the story of the POWs.

Cho Chun-sam and Noh Dae-gyu, now both in their thirties, are old friends who went to the same elementary school. In their school days, Chun-sam was always the ambitious class president, while Dae-gyu had to settle for a role as vice president. Twenty years later their roles are reversed: Chun-sam is now a humble farmer who has assumed the post of village chief in his hometown, while Dae-gyu is the newly elected county magistrate. At first, Chun-sam asks his old friend for favours regarding the development of his village, but these requests are turned down. Later, when Dae-gyu proposes building a nuclear waste disposal facility in the county, Chun-sam leads demonstrations against the plan, turning old friends into bitter rivals.

A connected series of love notes scribbled in library art books convinces grocery store clerk Hyun-chae that a mystery man, known only as 'Vincent', is pursuing a relationship with her. Meanwhile, a friend from her high-school days, subway driver Dong-ha, has relocated to Seoul to pursue a relationship with her.