The Record of Hairpins was a mystery novel written by the author of the ancient Chinese novels White Night Journey and The Three Bodies. The story was about a woman named Gao Ding who met a detective named Li Tanhua by chance. She worked with Li Tanhua to investigate a series of murders. In the story, Gao Ding gradually developed a good impression of Li Tanhua because of his excellent reasoning, but Li Tanhua had complicated feelings for her. During the investigation, Gao Ding and Li Tanhua discovered many secrets hidden in daily life and revealed the dark side of society. In the end, Li Tanhua chose to commit suicide because he could not bear the pressure in his heart. Gao Ding also made a choice because of his love for him. The whole story was based on the encounter and emotional entanglement between Gao Ding and Li Tanhua, interwoven with many mysterious events and bizarre murders to show the complexity of the customs and human nature of ancient Chinese society.