In the formation of every great nation, many battles are fought by those who have clashing ideologies and political views. It is said that during the establishment of the fledgling Joseon Dynasty, six dragons held vast powers and each fought for their political views. These six dragons — Prince Lee Bang Won (Yoo Ah In), Jeong Do Jeon (Kim Myung Min), Lee Seong Gye (Chun Ho Jin), Boon Yi (Shin Se Kyung), Ddang Sae (Byun Yo Han) and Moo Hyul (Yoon Kyun Sang) — fall on opposite sides of a power struggle between those who want a country ruled by ministers and those who want absolute power. Do Jeon helps his father, Seong Gye, who becomes the first King Tae Jo, establish the Joseon Dynasty, but Bang Won, who later becomes King Tae Jong, will become his biggest enemy.