Hwarang: all without knowing

Somewhere in the capital of Silla, lives the true-bone daughter of Kim Wiwha (founder as well as the first Chief of the Hwarang). She lives a peaceful life after her father went to jail ten years ago. Her mother brought her to Kangsung's household, and left the capital.

How will her life change when Hwarang is made? What will happen to her friends and family? How does she experience all the sudden changes? Which side is she on? Will she follow her 'brother'? Or will she believe in the mysterious king?