As a mystery novelist, Zhu Yu has gone a long time without writing anything worthwhile, and lives every day under the shadow of his father, a comic artist.
By chance, Zhu Yu comes into possession of a notebook. It records a murder that took place thirty years ago. The yellowed pages, covered in delicate handwriting and accompanied by old photographs, draw Zhu Yu into that bloody night.
Excited, Zhu Yu flips to the last page to learn how the case ends, only to find a sentence slowly appearing on it:
Who are you?
Theme: Striving tirelessly for the truth
