The book was written on the eve of the earthquake in Taiwan on September 21, 1999. In those tough times, it touched many lonely hearts, like a smiling moon hovering over a sorrowful,dark city. However, when the darkness outside the city disappears, the invisible darkness becomes deeper and deeper within the hearts loneliness and disturbances. Therefore, the story of the gentle moon and the boy still manages to provide light. A creative and accurate depiction of reality, touching people's heart.