On June 3 it was announced that Sin Se Kyung would take a leading role in the upcoming 50-episode drama "Six Flying Dragons." She will play Boon Yi, the woman that Lee Bang Won, later King Taejong, loves. But she is not the only woman in the life of the man who will do whatever it takes to acquire the throne. On June 4 it was announced that Gong Seung Yeon has been cast to play her romantic rival.

Gong Seung Yeon, who trained as a singer under SM Entertainment" and played Go Ah Sung's sister in "Heard It Through The Grapevine," has been cast as Min Da Kyung. Min Da Kyung is one of the many women who want Lee Bang Won's love but she does not get it. Even though she does not win his love, she still wants to be his queen.

The drama focuses on the story of some real-life historical figures and adds a few fictional ones.

The real-life figures include Prince Lee Bang Won, who later became King Taejong, and Jung Do Jeon, his advisor. Yoo Ah In plays Prince Lee Bang Won. The prince helped his father found the Joseon nation and thought that earned him the succession. But he fought with his brother princes to secure the throne. Once he acquired that throne, he wanted to maintain complete authority.

Kim Myung Min plays Jung Do Jeon, his political rival, a man who hopes for a more democratic nation Jung Do Jeon wanted a country ruled by ministers, while the prince wanted the monarchy to retain absolute power.

Also appearing in the drama are Byun Yo Han, last seen in "Ex-Girlfriends Club" and "Misaeng." He will play the brother of Shin Se Kyung's character. His character is also Jung Do Jeon's bodyguard. Also appearing in the drama are Chun Ho Jin, Yoon Kyun Sang and Jung Yoo Mi.

Kim Young Hyun and Park Sang Yeon, the writers crafting the screenplay for "Six Flying Dragons" previously wrote the successful saeguk "Tree With Deep Roots." Director Shin Kyung Soo also worked on "Tree With Deep Roots." The new drama is a prequel to that one, as it features some of the same characters when they were young.