The film tells a story of 2 girls who were born on the same day and unintentionally switched at birth. Their lives are completed changed due to the misplacement when they are returned to their respective families.

After the Spirit-Flower that guards the human realm exhausts its power and requires a new flower soul, the sinister Lord Hanlin seizes the opportunity to help the ancient demon Yu Beast invade. With a great calamity imminent, Jiang Chen and Qing Luan embark on a desperate quest to find the missing flower soul. Through shared trials and life-and-death tribulations, love blossoms between them—only for Qing Luan to discover that Jiang Chen himself is the very flower soul they seek. In a final act of sacrifice, Jiang Chen offers his life to reignite the Spirit-Flower, defeating the forces of evil. In the aftermath, Qing Luan keeps eternal watch over the reborn flower, guarding the realm they saved together.

A fallen immortal's split soul sparks an epic conflict between two vessels of fate, ending in a heroic sacrifice that leaves a grieving lover on a lifelong quest for resurrection.

Three hundred years after the Battle of Penglai, Baili Tusu is revived and must face a new threat when the demon Chi You takes control of Ouyang Shaogong to endanger the three realms.