Mo Heng is a young man who is accustomed to wandering between dawn and dusk. His world was quietly torn apart by an unnamed letter - the letter recorded the coordinates of the disappeared city and a riddle about "forgotten magic". The trivial reality and inner poetry are intertwined in him: he longs to use magic to repair his mother's forgotten memory, but he is afraid that out-of-control magic will alienate him from the world. The story flows lightly under the eaves of the city and in the gaps between magic. Mo Heng and a group of similarly forgotten souls go searching together. They guard the glimmer of humanity with their gentle rebellion. The novel depicts the boundary between magic and reality with delicate brushstrokes, explores the essence of memory and identity, and tells a story of self-discovery and reconciliation that belongs to everyone in a fresh and elegant atmosphere.