Fan Xian discovered what the secret of the Temple was.

Fan Xian discovered that the secret of the Temple was that it was actually a military museum. It stored weapons used by prehistoric humans, technological samples, and seeds of other civilizations. In addition, the temple was controlled by an AI, which carried out the intentions of the temple and sent robot messengers to spread the seeds of civilization. Fan Xian also learned through the holographic projection of the Temple that Earth had experienced the winter after the nuclear war hundreds of thousands of years ago. Human technology was highly developed, but because of the constant wars, Earth's civilization had been destroyed, and Earth had become the place with the highest nuclear radiation. Before humans left Earth, all weapons, technological samples, and seeds of civilization were preserved in the temple.

Fan Xian discovered the Temple in " Celebrating Years." The temple was originally regarded as a holy land by people and was a place full of mystery. However, during Fan Xian and the others 'exploration, they discovered that the Temple was actually an existence similar to a military museum. There were large amounts of military weapons and technological equipment hidden inside. These equipment were controlled by the intelligent system inside the temple, following the Three Laws and the Zero Law to strictly control and supervise humans. The temple also preserved some of the most terrifying existences of Earth's civilization before the nuclear explosion, such as the heavy sniper Barrett, advanced industrial technology, martial arts secret manuals suitable for human cultivation, and a large number of books on Earth's civilization. Through his communication with the holographic projection in the Temple, Fan Xian learned how his world was destroyed. After countless nuclear bombs were thrown, the entire land was destroyed by high temperatures and radiation, followed by floods, frost, and never-ending snow. The controller of the temple was an intelligent " AI ". It strictly enforced the four laws of the temple and sent robot messengers to the human world regularly to spread the seeds of civilization. Fan Xian also discovered that Lin Dabao was one of the emissaries of the Temple.

Fan Xian discovered the secret of the Temple in " Celebrating Years." The temple was actually a modern military museum located in the extreme north of Earth. It contained the most terrifying existence of Earth's civilization before the nuclear explosion, including the heavy sniper Barrett, advanced industrial technology, martial arts secret manuals suitable for human cultivation, and a large number of books on Earth's civilization. The top of the temple was covered with dense solar panels that could operate during the day. The controller of the temple was an intelligent " AI ". It could exist for hundreds of thousands of years and continuously repair the temple. Through the arrangement and layout of the words in the Temple, Fan Xian guessed that these words meant a military museum. The secrets of the Temple were inextricably linked to Fan Xian's background. Fan Xian was Ye Qingmei's son, and Ye Qingmei had escaped from the Temple.

The secret of the Temple that Fan Xian had exposed was that the Temple was actually a military museum. It stored weapons used by prehistoric humans, technological samples, and seeds of other civilizations. In addition, the temple was controlled by an AI, which carried out the intentions of the temple and sent robot messengers to spread the seeds of civilization. Fan Xian's exposure attracted the attention of the four Grandmasters. They decided to join forces to take revenge on the Qing Emperor. However, in the decisive battle, the Qing Emperor used Ye Liuyun and Ku He to pin down Sigu Jian. In the end, only the Qing Emperor survived. In order to avenge Chen Pingping, Fan Xian engaged in a fierce battle with the Qing Emperor. In the end, he heavily injured the Qing Emperor. Before the Qing Emperor died, he expressed his curiosity about the eyes under Wu Zhu's blindfold. He did not expect Wu Zhu to have laser eyes. In the end, Wu Zhu took off the blindfold and killed the Qing Emperor.

After Fan Xian entered the Temple, he discovered some secrets. The temple was actually a modern military museum, with solar panels covering the top. From the arrangement and layout of the words, Fan Xian guessed that these words meant military museum. In addition, there were many weapons and technology samples preserved in the temple. It was actually a huge arsenal. The temple was controlled by an AI that carried out the temple's intentions and sent robot messengers to spread the seeds of civilization. After Fan Xian entered the Temple, he also recovered Wu Zhu's memories. Fan Xian was filled with mystery about the Temple and developed a strong interest in its location.

In the end, Fan Xian successfully opened the secret door at the bottom of the lake. According to Ye Qingmei's instructions in the letter, Fan Xian followed her directions into a room in Taiping Courtyard and found a secret door. Although the search results did not clearly mention what Fan Xian found after opening the secret door, it could be inferred that Fan Xian might have found some important information or items inside the secret door. As for what Fan Xian had found in the secret door, the search results did not mention it, so it was impossible to confirm.

After Fan Xian opened the secret door, he found a lot of bullets.

In the end, Fan Xian successfully opened the secret door at the bottom of the lake, but the search results did not clearly mention what Fan Xian had discovered after opening the secret door. Therefore, based on the information provided, it was impossible to determine what Fan Xian had discovered after opening the secret door.

Fan Xian did not tell the Qing Emperor the secret of the Temple. Fan Xian knew that he was the Qing Emperor's son and that the Qing Emperor had racked his brains to try to get the secrets of the Temple out of Xiao En. However, there was no mention of Fan Xian telling this secret to the Qing Emperor. Therefore, according to the information provided, I don't know if Fan Xian told the Qing Emperor the secrets of the Temple.

Fan Xian went to find the Temple in " Celebrating Years." The temple was a military museum located in the northernmost part of the earth. It contained weapons and other items used by the prehistoric civilization. Fan Xian had entered the Temple because he wanted to find Ye Qingmei and unravel the secrets of the Temple. The existence of the temple was top secret, and only transmigrators could enter. After Fan Xian entered the Temple, he understood the true situation of the world, including the fact that humans had left Earth after the nuclear war. In addition, Fan Xian had received help in the Temple. His martial arts had also improved. The reason the Temple had ruthlessly killed Fan Xian was because Fan Xian knew too many secrets about the Temple. The Temple had to protect its own interests as a whole. In short, Fan Xian had a complicated relationship with the Temple. To him, the Temple was both a help and a threat.