Two actors who became stars through their roles in "The Heirs" will reunite for the indie film "Twenty." It's a romantic yet realistic comedy about three 20-year-old best friends who have plenty of expectations but little experience with life.

Kim Woo Bin, who played bad boy Choi Young Do in "The Heirs" and Kang Ha Neul who played rebellious Lee Hyo Shin play two of the three friends. 2PM's Junho will play the third 20-year-old.

Director Lee Byung Hun I, worked as a writer on the film "Speedy Scandal," which was number one in the Korean box office when it opened. He wanted to make a film about what it's like to be 20, an age when life is full of possibilities. He hoped that the film would appeal to those turning 20 and those who can remember it well.

The first person he cast in the film was Kim Woo Bin. The actor will play Chiho, an unemployed young man who is passionately obsessed with the opposite sex. After his success in "The Heirs," Kim Woo Bin received many casting offers, most recently appearing in the heist film, "The Technicians."

The next person to be cast was singer-actor Lee Junho, who proved his acting ability in the film "Cold Eyes." In that film Junho played Detective Daramjwi, a character also known as Squirrel. In "Twenty," he will play Dong Woo, an aspiring cartoonist. He works various jobs while trying to get into college. He has a dream but no practical idea of how to achieve that dream.

At one point actor Yoo Yeon Suk was offered a leading role in the film but he had to decline due to scheduling issues. It is not known which role he was offered.

Kang Ha Neul fills the role of the third friend in the trio. His last drama role was in "Angel Eyes" with co-stars Gu Hye Sun and Lee Sang Yoon. He played the role of the young Lee Sang Yoon. He also appeared in the films "The Age of Innocence" and "Mourning Grave." In "Twenty," he will play Kyung Jae, a college freshman living a comfortable life. But the fact that he has everything he needs doesn't mean he does not continue to want what everyone else has.

"Twenty" is Lee Byung Hun I's second film as a director. Last year he directed an indie film titled "Be Strong Byung Hun." According to the film's distributor NEW, "Twenty" is scheduled to begin filming this summer.