Yungang Grottoes is located in the southern foot of Wuzhou Mountain, 17 kilometers west of Datong City, Shanxi Province, northern China. There are 45 main caves, 252 large and small cave niches, more than 51,000 stone carvings, one of the largest ancient grottoes in China, and Dunhuang Mogao Grottoes, Luoyang Longmen Grottoes and Tianshui Maijishan Grottoes are called China's four major grotto art treasure houses.

The grottoes were excavated during the Northern and Southern Dynasties and the Northern Wei Dynasty, and no more repairs were carried out during the Sui and Tang dynasties. In the Liao Dynasty, during the period of Liao Xingzong and Taoism, the Liao royal family had carried out large-scale renovation of the Wuzhou Mountain Cave Temple for ten years. And built the grottoes in front of the wooden eaves of the cave Tongle, Lingyan, Whale Chong, Zhenguo, Huguo, Tiangong, Chongfu, Tongzi, Huayan, Doushi ten large temples, and more than 1,000 Buddha statues were renovated.

It is a pity that after the Jin soldiers captured Datong, many places were affected by the war, "the temple was burned, the Lingyan building, swept away". Until the third to sixth year of the reign of the Jin Emperor (1143-1146), the abbot Master Yuhui rebuilt the "Lingyan Pavilion" to reproduce the past scene of the grotto.

Later, at the end of the Ming Dynasty, the Qing army entered the customs, and the entire temple was burned down and reduced to ashes. After several restorations, it was not until after the founding of the People's Republic of China that a special protection agency was set up that the cultural relics of the grottoes were finally properly protected.

This book does not involve all the grottoes, but the protagonist hides with the help of Master Yuhui in order to avoid the pursuers, and there are not many descriptions of the grottoes and temples.