Before Master Mo returned to the mountain, Fan Li knew it was safe to use the vial in Shen Shou Valley, since the valley was inhabited solely by him and rarely visited by outsiders. This ensured that no unforeseen incidents would occur during this period, allowing him to use the small vial with confidence. Estimating the time it would take for Master Mo to return, Fan Li believed he would not find any particularly good herbs nearby and would likely have to travel to more remote, less accessible mountain forests—only there could rare herbs be gathered. With the time required for the round trip and the time spent searching for herbs, it would take at least nearly a year before he could return to the mountain. Now, nearly six months had passed since Master Mo descended, and Fan Li estimated that Master Mo would return to the Qixuan Sect in another six to seven months. During these days before his return, Han Li had made it his priority to cultivate as many useful herbs as possible, carefully gathering them according to several rare formulas he knew, rather than wasting them randomly. The medicines Han Li was about to prepare—those that would enhance his own cultivation and help him break through current limitations—were all premium holy formulations previously desired by Doctor Mo, yet never fully assembled due to the unavailability of required ingredients. Each of these medicines was so rare that even a typical household would be forced to sell off all its assets to obtain one, and they were fiercely contested among the martial circles. Despite Doctor Mo’s exceptional medical expertise, he had never seen any of these finished formulations before, let alone personally prepared them. Indeed, although he possessed the precise recipes, without the necessary herbs, he could only sigh in frustration. When Han Li was studying medicine under Doctor Mo, he was deeply fascinated by these rare formulas. Though he never expected to be able to prepare these exceptionally precious medicines himself, he diligently recorded many of them. Doctor Mo, in turn, was indifferent to Han Li's enthusiastic pursuit—whenever Han Li asked, Mo would provide detailed explanations without any intention of withholding information. Probably Mo himself regarded these formulas as mere side dishes, neither particularly flavorful nor worth discarding. Now, however, these formulas have become Han Li's cherished treasures. He carefully follows the prescribed herbs of various ages, nurturing the medicinal plants with unwavering diligence, never relaxing at all. After all, the time he has is limited—he must prepare these medicines before Doctor Mo returns and then store the bottles safely, never to use them again on the mountain. Han Li had absolutely no confidence that he could use the small bottle before Doctor Mo without revealing any clues. He was well aware of how sharp and cautious Doctor Mo was, and he had not the slightest intention of telling him anything about the secret of the bottle. Han Li felt that his relationship with Doctor Mo was quite unusual, far more than a simple master-apprentice bond. Doctor Mo often gazed at him with a peculiar look, which made Han Li feel as though there was some hidden secret against him—especially in the past one or two years, when this sense had grown even stronger. As a result, their relationship could no longer be as close and open as that of ordinary master and apprentice. Master Mo was actually very kind to Han Li in daily life—neither striking him nor scolding him harshly. He went out of his way to provide the very best conditions for Han Li’s practice of the oral technique. Yet there seemed to be an unspoken distance between them, a somewhat awkward atmosphere lingering between them. Master Mo was clearly aware of this gap, yet he showed no intention to bridge the emotional divide. He continued to diligently urge Han Li to make steady progress in mastering the oral technique. However, the once unusual expression in his gaze when looking at Han Li seemed to fade gradually, and for a long time, it never reappeared. Yet Han Li's keen intuition subtly suggested to himself that the other party hadn't truly given up on him—instead, they had skillfully concealed their intentions. As a result, Han Li, the physician, felt even more on guard. Under such circumstances, how could he dare to reveal the secret of the bottle to the physician! From numerous historical texts, Han Li had learned a firm principle: "One need not harbor ill will toward others, but one must never lack vigilance." Whether or not the physician truly intended to harm him, or whether it was merely a misperception in his own judgment, strengthening his alertness was always a sound course of action. If the physician indeed harbored ill intentions, his vigilance would protect him from harm. If, on the other hand, it was merely a misjudgment by Han Li himself, then his heightened awareness was equally justified. And in no case would Han Li willingly act in a way that would betray his master or dishonor his position as a devoted disciple. He remained, in truth, the physician's worthy and loyal apprentice, faithfully fulfilling the duties expected of a true disciple. Han Li felt somewhat uneasy as he thought about it. He and Dr. Mo—such an unusual master-apprentice pair—were surely unique within the Qi Xuan Sect. He sighed lightly. The bottle must be used immediately; it could never wait until Dr. Mo returned. After all, no wall is completely impermeable. Even if he managed to avoid Dr. Mo’s notice, others in the Sect might still stumble upon the secret. The safest course was to keep the bottle hidden, as if the entire incident had never happened. Han Li had made all the necessary arrangements and had firmly resolved to keep the bottle securely stored, using it only sparingly in the future. With that settled, he felt a sense of relief and drifted off to sleep, half-drowsy and content. Over the following months, Han Li quietly used the green liquid from the bottle to cultivate a large quantity of precious medicinal herbs. Using these herbs, he carefully prepared numerous rare medicines according to the formulas. However, during the preparation process, he encountered several failures—each one left Han Li deeply disappointed. After all, every herb used was among the finest and most scarce in the world; a single failure meant countless silver coins were wasted. Yet this was not entirely his fault. These formulas were all being tried for the first time, so several setbacks were inevitable—even Master Mo, who personally oversaw the preparations, would occasionally make mistakes. Han Li could only console himself with this understanding. The famed rare medicines—“Yellow Dragon Pills,” “Clear Spirit Powder,” “Golden Essence Pills,” and “Nourishing Essence Pills”—were all placed in a dozen small bottles and arranged neatly before him. Seeing these medicinal bottles, Han Li’s face lit up with delight. With these potent elixirs, not only would he easily achieve the fourth level of the technique, but even the fifth and sixth levels would come within reach with little additional effort. Among these medicines, "Huanglong Dan" and "Jinmei Wan" have proven most beneficial for his cultivation, both enhancing his inner strength and bringing about a fundamental transformation; "Qingling San" is a rare and supreme remedy for detoxification, capable of neutralizing a thousand and one severe poisons throughout the world; finally, "Yangjing Dan" is a miraculous medicine effective against both internal and external injuries—regardless of the severity of the injury, once a single pill is taken, even if it cannot restore the patient to full health, the condition will be immediately alleviated, significantly improving recovery prospects and ensuring survival.