In Lincheng, a future city where rain and neon are intertwined, Lin Mo is a "memory restorer." He can dive into the depths of other people's broken consciousness and mend forgetfulness and trauma. He lives by it and exiles himself by it, wallowing in the pain of being unable to repair his past. One day, a mysterious woman named Su Wan came to the door with a dusty silver music box and asked him to retrieve a "forgotten memory about the music box" of her deceased husband, Mr. Gu. Lin Mo accepted the commission, but found in Mr. Gu's collapsed memory palace that the memory was not a warm loss, but a deliberately buried "dark area" full of fear and danger. The fragments of truth will lead him to a conspiracy far beyond imagination, and force him to face his long-standing nightmare.