The drama revolves around the power struggles, love and growth within four characters in the ancient city of Asdal, the capital of Gojoseon.
Eun Sum (Song Joong Ki),was born with the destiny of bringing destruction to Aseudal. Because his mother fought to save him, he goes through all sorts of adversities as he grows up. Years later he returns to Aseudal to fulfill his destiny.
Ta Gon (Jang Dong Gun),is a war hero of Aseudal. He has paved the way for Aseudal to become a very prosperous nation, and he is the most powerful person in Aseudal, nobody ever dares to question him, and he is admired as he is feared. Helong dreams of becoming the first king of Aseudal.
Tan Ya (Kim Ji Won),was born with the same fate as Eun Sum, their fates are both intertwined. She has also gone through many adversities over the course of her life, She is very clear about what her mission will be. Her greatest ambition is to become a politician.
Tae Ha (Kim Ok Bin), a woman who is the last descendant of the Noeantal, a race completely different from humans. Her ambition knows no bounds.