Intro. Solar eclipse... Gates between worlds. At this moment, Go Ha Jin disappears from the 21st century to be reborn in the Goryeo era. She wakes up in Hae Soo's body, remembering the past but trapped in someone else's time. A thousand years separate her from home. In the whirlpool of passions, Hae Soo seeks faith in goodness. Her modern intelligence and empathy make her stand out. She becomes a friend and advisor. But fate brings two princes into her life. Wang Won, the 14th Prince, is sincere and pure-hearted. He is like the spring wind. His naivety awakens tenderness in Hae Soo. He does not seek power, he just wants to protect his loved ones. Wang Chong is her friend and support. Wang So, the 4th Prince, is branded and cruel, but Hae Soo sees his suffering soul. A strong feeling flares up between them. A love triangle is born, where every choice is between the heart and fate. At first, Hae Soo's life is filled with carefree days in the palace. But the world of Goryeo is cruel. Emperor Taejo is against Wang So and Hae Soo's love, wanting to marry him to Yeonghwa, Wang So's half-sister. Yeonghwa is in love and ambitious.