The first appearance was when Chen Nan came back after the battle with the seven ancient kings. When he had no power at all, he obtained the origin of time and space power from the master of time and space. In order to find the fountain of life, he returned to ancient times and accidentally discovered that Dugu was defeated. Heaven, Dugu Baitian's son Dugu Xiaobai was Chen Nan's previous life. In order to save him, Baitian modified and perfected Chen Zhan's Feng Shui formation in the Gods and Demons Cemetery and was resurrected. If you look back, there will be records