Yiyi is the daughter of the former princess of Mercury. When the princess gave birth to her, an enemy force besieged the city, and a servant took Yiyi to Jupiter to start a new life. At the Valley of the Medicine King, she met Zhen. They trained together, then took part in the Nine Stars Contest. Facing every challenge together, they won and headed to Mercury, where Yiyi would take her revenge. But Yiyi was no match for the Sea Horse King. To save her, Zhen scattered the fragments of their soul across the Nine Stars...
