Xingyin lives a contented but isolated childhood with her mother, the Moon Goddess who is forbidden to leave her domain. But after Xingyin experiments with magic lights around her, the Celestial Empress visits accusing her mother of trying to escape from her imprisonment. Fearing her daughter will be discovered, she instructs Xingyin under the protection of Ping’er, to hide in the Southern Sea with Ping’er’s family. During the journey, they are attacked by Celestial soldiers and the pair are separated. Alone, Xingyin must forge a new life in the Celestial Kingdom in the hope that she can free her mother from the chains of her isolation.