After Yun Lin finished paying his respects to Master and the four Elders, Third Senior Brother Yun Shuo also bowed to him and said, "Senior Brother."

"Welcome back," Yun Lin nodded at him. "I heard from Junior Brother Yun Ting that you found some clues about the annihilation of Wanling Valley down the mountain?"

"Yes, Senior Brother." After responding to Senior Brother, Yun Shuo turned his gaze towards Master. He conveyed the information he had discovered to Senior Brother only after receiving Master's nod of approval.

In fact, when the Valley Master of the Magic Spirit Valley, Qiu Ci, sought help from the Profound Melody Sect, he had already revealed that the ones targeting them were the Demon Clan. When Yun Lin and his junior brothers arrived at the Magic Spirit Valley, the evidence on the scene, the horrific state of over a hundred deaths, and the injuries on their bodies further confirmed this point. However, the current Demon Clan is similar to the Human Realm; although they have a Demon Lord ruling over them, they also face internal strife and external troubles. Especially with escalating internal conflicts, there is a growing trend of division within the Demon Clan. There are also numerous factions within the Demon Clan, all seemingly obedient to the Demon Lord, but in reality, each has its own leader.

So which faction of the demon race was responsible for the attack on Wanling Valley, Xuan Yin Sect is unaware of. However, Qiu Ci mentioned in his letter that it was due to a grudge between Wanling Valley and the demon race that began ten years ago. But the exact nature of this grudge, he did not even inform his close friend, the head of Wu Chen Sect.

If you want to talk about what happened in Wanling Valley ten years ago that was related to the Demon Clan, the Sect Master of Wu Chen remembers one incident. Qiu Ci once took in a pair of orphans as disciples, a brother and sister. Wu Chen can't remember the brother's name, but he still remembers the sister's name, Yao Huan. Yao Huan was clever and talented, and within less than ten years of following her master Qiu Ci in cultivation, she was already among the top disciples. Wanling Valley is different from the Xuan Yin Sect that practices self-cultivation, so there aren't as many taboos, including marriage. Qiu Ci cherished this female disciple and treated her almost like his own daughter, hoping she would have a good future. So he arranged for Yao Huan to marry his highly regarded senior disciple. However, Yao Huan did not like her senior martial brother, so she refused this marriage. But Qiu Ci, as her master, always insisted. Yao Huan had a strong personality and would rather leave the sect than marry someone she didn't like.

When Qiu Ci found this disciple again, it was already a year later. Yao Huan was already pregnant, but she refused to disclose the identity of the child's father. After investigation, it was found that the child's father should be from the Demon Clan. Qiu Ci was furious and captured Yao Huan, bringing her back to the Valley of Ten Thousand Spirits. In front of the disciples, he subjected her to the harshest punishment, executing both her and the child in her womb.

So a few days ago, when the head of the Qianwuchen Sect received a distress letter from Qiu Ci, he learned that the demonic clan was planning to attack the Valley of Wailing Spirits. This made him suspect that this matter might be related to the death of Yao Huan ten years ago.

Before the demons started their attack, they arrogantly informed the Valley of All Spirits in advance and successfully achieved their goal. It is likely that this demon has a certain status within their clan.

And Yun Shuo began his investigation based on the possibility provided by his master.

After more than ten days of investigation, Yun Shuo and several junior disciples found out that just a few days before the annihilation of the Wanling Valley, the Demon Lord sent dozens of demon soldiers to leave the Demon Clan. Surprisingly, the leader of the group was actually the young master of the Demon Clan. On the second morning after the extermination of the Wanling Valley, these demon soldiers returned to the Demon Palace. However, it seems that their young master did not go back, and recently the Demon Lord has been sending his subordinates to search everywhere.

"You mean to say that the reason why Wanling Valley suffered this calamity is because ten years ago, Valley Master Qiu Ci executed female disciple Yao Huan? And it is very likely that the demonic clan who was in love with Yao Huan ten years ago is from the Demonic Palace?" Yun Lin lowered his gaze, already having the answer in his heart. "To be able to make the Young Lord of the demonic clan lead an army for revenge, the one who was in love with Yao Huan ten years ago should be the Demon Lord."

"But it's also not necessarily the case." Yun Shuo, who personally investigated the matter, still had doubts in his heart. "According to my investigation, after Yao Huan was executed by Master Qiu Gu on the charge of colluding with the demonic clan, her older brother and senior martial brother both left the sect. The whereabouts of Master Qiu Gu's eldest disciple remains a mystery, but Yao Huan's older brother joined the demonic clan after her death. It's also possible that this time, the Demon Lord is leading the troops to avenge his sister. Furthermore, Master Qiu Gu indeed has a seven or eight-year-old son. However, when he was five years old, the child fell ill with an incurable disease. Despite seeking treatment from renowned doctors, Master Qiu Gu was unable to cure his son's ailment. In the end, he sent the child to Kui Xing Pavilion and had him apprentice under the Pavilion Master, who saved the child's life with divine medical techniques. Just to make sure, before returning to the Xuan Yin Sect, I went to Kui Xing Pavilion and had the opportunity to see the child. He is not the same child we saved in the Wan Ling Valley."