고려 태조의 넷째 아들인 왕소는 나라를 피로 물들일 것이란 예언을 받은 이후 저주받은 왕자로 불린다. 그가 여덟 살 때 형이 의문의 죽음을 당하자, 아들을 염려한 태조는 왕소를 금강산으로 보내 왕실의 혼란을 피하게 한다. 태조를 시해하려다 실패한 사건이 벌어지자, 왕소는 범인을 직접 잡기 위해 나섰다가 신율이라는 여인을 만난다. 신율은 발해의 마지막 공주로, 다른 나라의 빛이 될 것이란 예언을 타고 태어나면서 여러 번 죽을 위기를 겪는다. 왕소와 신율은 서로를 사랑하며 불길한 저주를 뛰어넘어 그들의 의지대로 삶을 개척하는 법을 배운다.
Wang Soe, a prince of Goryeo, is the fourth son of King Taejo. He is called a cursed prince as it's been foretold that he will make the kingdom of Goryeo covered in blood. His brother was killed when he was eight years old, so he was sent to Mount Geumgang so that he could grow away from the turmoil at the palace. Shin Yule is the last princess of Balhae. She was born with the prediction that she would become the light of another kingdom. She was almost killed due to that prediction, but she has become a business magnate with her skills and brilliance. Wang Soe meets Shin Yule and learns the meaning of free will through her. He turns into a true leader through the only woman he loves.