Ten years ago, the seventh prince Long Yan disappeared during the palace chaos. Concubine Ruan was executed, the prince disappeared, but the truth was buried.
Ten years later, the boy in purple returned to Kyoto's Zihua. He smiled in front of the flowers and became famous in the capital.
What does Long Yan, who has a family feud, want to do? Can all the mysteries of that year be cleared up? What kind of tangled red thread will be drawn out by the gentle call in the dream?