After sending Chong'er away, Chen Xiang returned to the post house and immediately ordered someone to bring a list of Zheng Guo's magnates, and study their living habits and hobbies one by one, and he wanted to act quickly in Zheng Guo. The sorting work is very complicated, fortunately there are green beads by his side to help, after a night of hard work, finally finished, the next is to buy gifts according to the characteristics of each magnate, for which Chen Xiang almost spent the wealth brought by Chen Xiang from the country.

In the blink of an eye, Chen Xiang spent three years in Zheng Guo, and these days Chen Xiang's post house is really crowded, and there is an endless stream of new Zheng magnates who come to visit. Chen Xiang drank a lot of wine and was generous, and he was very popular with Zheng Guo's sons, and these sons and sons often said good things for Chen Xiang in front of the monarch, and Zheng Guojun gradually began to have a good impression of this proton, and often invited him to participate in some banquets in the palace.

Over the years, the country has been implementing the method of liquidation advocated by Chen Xiang, agricultural production has been greatly developed, the warehouses in various places are substantial, people live and work in peace and contentment, these years Zheng Guo's restrictions on the exchange between Chen Xiang and the country have gradually decreased, the king of the country can often send a large amount of money to Chen Xiang for expenses, of course, he often has to pay tribute to the monarch of Zheng Guo, Chen Xiang is also very convenient to send the information collected in Zheng Guo back to the country.

It's the annual temple festival day again, Zheng Guojun will hold a banquet every year after the temple festival on this day, which also invites protons from all over the world to participate, and this year Chen Xiang was arranged to sit next to the monarch.

The warblers sang and danced under the banquet, and the banquet was staggered, so lively and noisy. Chen Xiang had been carefully serving the monarch, and found that the monarch's face was slightly pale and the amount of wine was not as good as before, so he took the opportunity of the toast and asked softly: "The king seems to be in poor spirits today, is it because of the busy state affairs recently?" The monarch replied, "For some reason, in recent days, I have always been unable to lift my spirits, so I asked the imperial doctor to diagnose and treat and take the decoction, but it did not have much effect. After hearing this, Chen Xiang leaned close to the monarch's ear and whispered: "The king's situation seems to be the same as my father a few years ago, when he asked famous doctors from all over the country to diagnose and treat, and thought it was caused by overwork, so he prescribed some tonic decoction, and then became weaker and weaker, until his limbs could not move, and he was dying. The monarch hurriedly asked, "Then can Gongzi Ji introduce me to that master?" Chen Xiang shook his head and said, "Since my father recovered from his illness, the master has disappeared, and my father and I have been searching for many years to no avail. The monarch sighed and said, "Ahem, it's a pity, it's a pity." Seeing this, Chen Xiang hurriedly said: "The king doesn't have to be too sad, in fact, I have been assisting when the master was refining medicine, and I roughly remember the medicinal materials and the refining process, but because the process is too complicated, the memory is inevitably biased, and I have not been able to refine the exact same pill over the years, but I have been researching and improving it all these years, so I might as well try it." Hearing this, the monarch's eyes suddenly lit up, and he tightened Chen Xiang's sleeve and said: "Ji Gongzi is affected, please be sure to refine medicine for this king, and the required materials and people are at your disposal." ”

Will Chen Xiang really refine the so-called elixir? Of course not. What he wanted to refine for Zheng Guojun was not medicine, but a drug-caffeine. Chen Xiang's 'previous life' was a chemistry teacher, he had done an experiment to extract caffeine from tea when he was in college, and knew that this method was very simple, it could be completed under the existing conditions, tea could be purchased in large quantities, high-purity alcohol could be obtained by adding quicklime to drinking wine and then distilling, and as for the reactor of the extraction process, it could be replaced by an alchemy furnace.

After seven days of continuous extraction and refining, and after consuming a large amount of tea and wine, Chen Xiang finally made a grape-sized 'pill', when he opened the medicine box in front of the king, the whole palace was filled with the smell of commotion, which was the taste of caffeine, the king on the hospital bed immediately sat up, the strong smell of medicine almost made him crazy, and desperately shouted: "Ji Gongzi, quickly give this king medicine." Chen Xiang gently put the pill into the monarch's mouth, and took a cup of warm wine for the monarch and the medicine to swallow. The monarch immediately felt hot all over his body, a surging heat wave seemed to be gushing out of his body, he really couldn't stand it, he lifted the quilt hard, jumped off the hospital bed, and ran back and forth in the palace, the eunuchs all exclaimed when they saw this, Ji Kanggongzi's medicine was really amazing, and the monarch was also overjoyed, and laughed: "Ji Gongzi has made merit in refining medicine for me, and this king will reward him heavily." Chen Xiang suddenly knelt down and said, "The king forgives me, since I have not yet fully understood the method of alchemy, this medicine can only temporarily relieve the king's physical weakness, but I will continue to refine better pills for the king." The monarch hurriedly came over to help Chen Xiang up, and said with relief: "Ji Gongzi doesn't have to blame himself, you can refine this magic medicine for me, this king is already grateful, anyway, Ji Gongzi has always been in Zheng Guo, and there is time to study and improve, and he is not in a hurry." Chen Xiang smiled and said nothing.

After returning from the palace, Chen Xiang closed the door and thanked the guests, and has been stepping up refining medicine in the Dan room. Zheng Guojun's physical weakness is completely caused by his usual overindulgence, although caffeine can be a momentary refreshment, making people feel a hundred times more energetic, and suddenly become vigorous, but this is tantamount to a salary from the bottom of the kettle, not only can not cure the disease, but will accelerate the weakening, and this medicine is also very addictive, Chen Xiang has decided to use it to control Zheng Guojun.