A crown princess who doesn't do infrastructure construction isn't a good doctor.

The bookstore's business has gradually gotten back on track in the past few days. Its novel rental method has attracted many people to try it out, but not many people are selling some of the new stationery items.

Lan Feng was very anxious looking at the almost untouched stock of pencils, paintbrushes, and a series of derivative products, but Jin Wen remained calm and stopped Lan Feng from rushing to Qin Suiyou for help. Qin Suiyou also delegated the task to the two of them and usually didn't interfere much. However, he wasn't idle all the time. In the past few days, he had asked Li Yuanyuan to work with him on finding a way to detoxify Chu Huan.

After the imperial examination ended, Qin Suiyou conducted another detailed examination on Chu Huan. As expected, Chu Huan's physical condition was quite poor. Fortunately, Qin Suiyou administered acupuncture again to temporarily stabilize him. However, after that, Chu Huan could only stay in bed and wait for Qin Suiyou to find the best antidote.

To save time, when Qin Suiyou asked Li Yuanyuan for help, he also showed her the ancient book that happened to contain information about the Thousand-Day Intoxication poison. This simple act saved them even more time.

Ancient texts record that the most important ingredient in the Thousand-Day Intoxication poison comes from a poisonous flower called the Drunken Beauty. To cure it, one must find the venom of a snake that grows in the area and take it together with the snake's gall.

Li Yuanyuan once accidentally saved a merchant who had returned from the border between the Northern Region and the Northern Qian. The merchant was grateful and, seeing that she did not want to accept payment, gave her a dried flower of the Drunken Beauty. He also casually mentioned that the Drunken Beauty grew in a certain place, but the poisonous snake would need to be caught on the spot. Moreover, the antidote method recorded in the ancient books was extremely risky, and the proportions were very difficult to control. If one was not careful, the antidote would turn into poisoning.

The place in the Northern Region where the Drunken Beauty can grow is far away from Yejing. Li Yuanyuan is worried that she can't get her hands on the source of the antidote, and she is also worried that making the antidote is really very difficult.

But Qin Suiyou, who had an external advantage, was different. While Li Yuanyuan asked him to study the dried flowers, he asked Lu Yu to use unconventional methods to go to the Northern Region to catch some venomous snakes living near the Drunken Beauty. Lu Yu didn't even remember the locations that Li Yuanyuan had heard about from the merchants. After observing the dried flowers for a while, he set off without saying a word.

Finally, after only three days, Lu Yu returned, bringing back not only a black and green snake in a bamboo cage, but also a white and green unopened flower in his hands, which, upon closer inspection, resembled a living, breathing beauty.

While watching Qin Suiyou order Beitang Yan to collect snake venom and extract gallbladders from snakes, Li Yuanyuan asked a question that she couldn't figure out no matter how hard she tried.

"The Drunken Beauty grows in the Northern Region, and the venomous snake that can cure the Drunken Beauty's poison also grows in the Northern Region. Did Brother Lu Yu go to the Northern Region to pick the flower and catch the snake?"

Qin Suiyou replied matter-of-factly, "Otherwise, do you think he just grabbed one randomly? That wouldn't have mattered."

Li Yuanyuan's heart skipped a beat as she secretly calculated the time it would take a normal person to reach the Northern Region at top speed.

"Did he fly there?"

Qin Suiyou, unsure whether to agree or not, simply said, "Guess."

Li Yuanyuan really wanted to say: I dare not guess.

After letting his mind wander for a while, Li Yuanyuan stopped dwelling on the question. His intuition told him that no matter how much he persisted, it was useless, and that studying hard was the right path.

The rest of the process was quite simple for Qin Suiyou. He skillfully carried out the experiments. The only thing he had to worry about was figuring out which medicinal materials could minimize the harm to the human body from the antidote mixed with snake venom. As for the dosage and ratio, with Lu Xi, who could be quite useful when he was serious, he could save a lot of time on the step-by-step experiments by releasing a little bit of his spiritual sense to sense it.

After all, Chu Huan's health condition couldn't wait much longer, so Qin Suiyou felt quite at ease slacking off, as he was doing it for the patient's sake.

As for reducing the harm of the antidote, the dried flowers provided by Li Yuanyuan played a significant role. While thinking about it, Qin Suiyou considered the natural law of mutual generation and restraint, and carefully considered that the raw material of the Thousand Days Intoxication was taken from the pistils of the Drunken Beauty when it was in full bloom. So he tried adding dried petals, leaves, stems and fresh roots of the Drunken Beauty that he had forced to bloom early to the semi-finished antidote. The roots of the dried flowers were removed, so there was no control group.

However, the control group did not have much effect. What Qin Suiyou eventually found to be effective was the stems of dried flowers. It was probably due to some reaction that occurred during the drying process. So although the stems of fresh flowers also had some effect, it was not as obvious as that of dried flowers.

The process wasn't too complicated, and the result was satisfactory. After taking Chu Huan's blood, Qin Suiyou conducted an experiment on his own to confirm that there were no other side effects. Then, he called Chu Yuning, who was disguised, to go out of the mansion with him. Under Chu Yuning's expectant gaze, they went to the Southwest Bookstore to give Chu Huan an IV drip.

The renovated bookstore appeared to be much larger, but Qin Suiyou had actually arranged a room with a very discreet entrance for himself, so that he could use it whenever he felt like it but didn't want to disturb the people reading there.

Watching a needle with several unfamiliar and unheard-of objects pierce her brother's hand, Chu Yuning looked worried, but she restrained herself from asking any questions. Li Yuanyuan, who had come along as an "intern," carefully arranged the IV line for Chu Huan and asked, "Does this method mean that the antidote has to be delivered to all the meridians in his body?"

Seeing that Li Yuanyuan's operation was fine, Qin Suiyou lowered his eyes and continued to look at the "Classic of Mountains and Seas" in his hand.

“That’s right. The poison in his body has been there for three years and has spread throughout his body’s meridians. Intravenous infusion is the fastest way to treat it.”

There is actually an even faster way, but that would require Qin Suiyou to expend a lot of internal energy. After thinking about it, he decided that an IV drip would be easier and would also give Li Yuanyuan a chance to practice.

Oh dear, thinking about it this way, Qin Suiyou suddenly felt as if he had discovered a medical teacher in his previous life who took a picture of a sick patient based on the textbook and obtained the patient's consent.

Getting back to the main point, after Chu Huan finished his IV drip, the antidote in his body would consume a lot of his vital energy in the "battle" with the poison. Qin Suiyou remembered that he had given Chu Huan three Vitality-Replenishing Pills last time, so he asked if he could take them with him.

Chu Huan, who was feeling a bit drowsy, looked somewhat embarrassed upon hearing this.

"As you instructed, I took one pill the night before the exam. On the second night of the exam, I suddenly felt unbearable chest pain and felt weak all over, so I took a second pill. When the exam ended three days later, I found that a student was not in good condition and seemed to have been poisoned, so I gave him the remaining pill."

Qin Suiyou vaguely remembered that he had told Chu Huan that the Replenishing Yuan Pill had a certain detoxification effect, so he didn't care too much and said, "Then forget it. It won't do you any good if you take it now. Just stay here and rest for the next few days. I will ask Jinwen and Lanfeng to come and take care of you. In order to avoid too many people knowing, you should send your servants back to the mansion. Jinwen and Lanfeng will take turns on duty at the bookstore. There will also be people at night, so you can rest assured. We will see this through to the end. I will have someone send you some medicinal food tomorrow."

After giving these instructions, the brother and sister had a chance to catch up before the group returned to the Prince's residence.