Episode 13 recap: Han Feng killed the Snake People. Xiao Yan executed Han Feng.

Xiao Yan and She Cai Lin arrived at the alchemy room in the Flame Valley. It was gloomy and terrifying inside, with a stench of blood and decay in the air. She Cai Lin noticed snake scales and hair everywhere and couldn't contain her anger. She had come here to investigate the reasons behind the continuous disappearance of the Snake People, but she never expected to find them being ruthlessly slaughtered here.

It turned out that someone was using their bones and blood for alchemy, and the culprit was none other than Han Feng, who called himself the "Medicine Emperor." She Cai Lin immediately wanted to confront Han Feng, but Xiao Yan stopped her, advising her not to act impulsively. Xiao Yan knew that Han Feng would meet his end sooner or later, but they needed to investigate and find out the purpose of all the poisonous insects in this place.

She Cai Lin suggested that Xiao Yan seek answers from the alchemists, as their records might contain information. Xiao Yan immediately entered the storage ring to search for them. Upon seeing that Xiao Yi Xian was poisoned, Xie Shan had no choice but to take the refined demon core and find Han Feng to exchange it for the antidote. Han Feng coldly warned Xie Shan not to forget that he had sheltered them in the Flame Valley and provided them with a constant supply of pills to detoxify them. He interrogated Xie Shan, trying to uncover the relationship between Xiao Yi Xian and Xiao Yan. Xie Shan had to reveal the incident where Xiao Yan had saved Xiao Yi Xian. Han Feng learned of Xiao Yan's trust in Xiao Yi Xian and a new idea sparked in his mind. He forced Xie Shan to kill Xiao Yan.

Inside the storage ring, Xiao Yan searched through numerous ancient records and discovered that the Saliva of Bodhi Transformation could cure Xiao Yi Xian. Master Yao Chen was not present, so Xiao Yan had to figure out the process of refining the medicine himself. However, after several attempts, he was shocked to find that using poisonous insects to refine the medicine was a hundred times more potent than using herbs. Therefore, what Han Feng had given Xiao Yi Xian was not an antidote but a chronic poison that stimulated further poisoning. Xiao Yan was appalled by Han Feng's cruelty and realized that he needed to inform Xiao Yi Xian about this immediately.

Meanwhile, Xiao Yi Xian was under Han Feng's control and her life was hanging by a thread. In order to save Xiao Yi Xian, Xie Shan had to disguise herself as Xiao Yi Xian and approach Xiao Yan. However, Xiao Yan quickly saw through her ruse because Xie Shan's tone and scent were not familiar to him, and she even revealed a scorpion tail.

In order to make Xie Shan understand Han Feng's malicious intentions, Xiao Yan took her to the alchemy nest to see the truth. However, Xie Shan was deeply influenced by Han Feng and didn't believe Xiao Yan's words. Instead, she wanted to take his life. They immediately engaged in a fight, but Xie Shan was no match for Xiao Yan. After a few rounds, she hastily retreated. She Cai Lin, who was chasing after Han Feng's subordinates, Jin Yin Er Lao, joined Xiao Yan, and the two of them searched and tracked together in the Flame Valley. They arrived at a more secret cave and discovered that Han Feng was attempting to refine Xiao Yi Xian and extract energy from her. When Xiao Yan and She Cai Lin arrived, Han Feng's poison had already merged with Xiao Yi Xian, who was at a critical moment of life and death.

Seeing the situation, Xiao Yan disregarded She Cai Lin's obstruction and rushed forward. Xiao Yi Xian had saved him in the past, and now he couldn't just think about his own danger without saving her. Xiao Yan forcibly interrupted Han Feng's refining process, but he suffered a backlash in the process. Just as Xie Shan returned, she witnessed her sister being used as an alchemical ingredient by Han Feng. She Cai Lin tried to persuade her to see through Han Feng's true nature, but Xie Shan remained stubborn and believed that Han Feng was trying to free Xiao Yi Xian from the troubles within her body.

Taking advantage of Xiao Yan and Han Feng's confrontation, Xie Shan picked up a dagger, preparing to seize the opportunity to kill Xiao Yan. In her agony, Xiao Yi Xian used all her strength to dissuade Xie Shan from being influenced by Han Feng, emphasizing that Xiao Yan was a trustworthy person.

As Xiao Yan's Flame of Rebirth came into contact with Han Feng's poison, an explosion occurred, causing severe injuries to Xiao Yan. Han Feng revealed his true nature completely and viciously told Xiao Yan that he would make him witness Xiao Yi Xian's death before his eyes. He then prepared to extract energy from Xiao Yan. Hearing Han Feng's words, Xie Shan finally understood his true intentions and sacrificed herself to save her sister.

Seeing Han Feng's cruelty, Xiao Yan exerted all his strength and struck him down with a single blow. At this point, Xiao Yi Xian was extremely weak and heavily poisoned. Xiao Yan decided to take Xiao Yi Xian back to the Jia Nan Academy first and seek the help of the dean to revive her. Although She Cai Lin was dissatisfied with Xiao's decision, she agreed to accompany them to the Jia Nan Academy in order to save Xiao Yi Xian.