The Twins Hangul RRYeokjeonui myeongsu is a 2005 South Korean film and the debut feature of Park Heungsik. Jung Joonho stars as identical twins with opposing personalities.
Jung Joonho took on the dual role of Myungsu and Hyungsu to further his skills as an actor, and said, When I read the script, I really liked the story and wanted to star in the film... I begged the director to choose me. He prepared himself by studying the performances of other actors playing double roles in films, such as Jeon Doyeon in My Mother, the Mermaid and Park Shinyang in The Big Swindle. Prior to the launch of the film, Jung noted that he focused more on the character of Myungsu, feeling that the personality of Hyungsu was expressed less fully than he intended.The Twins opened in South Korea onApril 2005, and was ranked second at the Seoul box office on its opening weekend with 42,535 admissions. The film went on to accumulate a total of 602,078 admissions nationwide. ........
Source: Wikipedia