In the fictional setting of the Republic of China, the heroine runs a "dream agency" - through a special "pillow book" (an ancient book made from the scalp of the dead), she can make people spend a lot of money to "rent" other people's dreams, or "store" their own feelings in another person's dream. But every dream is not free. The dreamer must leave an "emotional memory" of his or her own in exchange, and these memories will be absorbed by the pillow book and become the "fuel" for the heroine's next dream. On the surface, she is earning money and being attached to powerful people. In fact, the heroine is playing a big game of chess - she wants to piece together a complete "memory puzzle" about her life experience and the truth about her family's destruction through dreams.
