Yin Yan is a Chinese author of documentary literature, though publicly available information about the author remains limited: nationality, dates of birth and death, educational background, and writing experience are not clearly recorded. One work by Yin Yan is included in the collection, the documentary literary title Guardians of Dunhuang. Judging from its subject, Yin Yan is concerned with the real-world issue of Dunhuang cultural heritage preservation, presenting through documentary writing the people and stories devoted to protecting Dunhuang. The writing tends to focus on specific individuals and on-site reporting, emphasizing factual recording and humanistic concern. Because information about the author is scarce, a full assessment of Yin Yan's creative trajectory and overall style is difficult, yet Guardians of Dunhuang shows a genuine interest in and commitment to documentary writing on cultural heritage. Readers who wish to learn more about Yin Yan may follow the book's content and any subsequent publications.