Chen Mo is an eccentric mystery novel writer. He likes retro dress, sharpening pencils with blades by himself, using retro colored metal pen caps, and revising manuscripts with pencils. For him, revising manuscripts with pencils is entering a new world, and he can immerse himself in the writing world. One day, after knowing that there was a murder case with the same murder technique in his book, he privately conducted an investigation, fragmentary memory and time and time of an empty let him stop, scattered clues and girlfriend whereabouts unknown let him unknowingly into a vortex......
