Taking Gaozong and Wu Zetian as the background of the times, it tells the story of Di Renjie's case as an official. It explains how Di Renjie viewed his career, how he pursued the truth of the case, and how he kept a clear mind in the era of sudden changes in the era, so as to gain Wu Zetian's appreciation, and finally prompted Wu Zetian to return power to Li Tang.
