Xuanyuan Han spent most of his precious day to finally quell the uproar at Fenghua Palace.

Just as he left Fenghua Palace and walked along the corridor leading back to his residence, the scene of Yi Shangyun making a solemn vow with three fingers together in Fenghua Palace kept replaying in his mind.

"Yi Shangyun hereby swears...in this life...I...Yi Shangyun...will never betray Princess Yue. Anyone who breaks this oath will be punished by heaven and earth."

As he pondered, his slightly lowered eyes flickered twice, and then a handsome smile appeared on the corners of his mouth.

"Your Highness, are you satisfied with the female physician I selected for the Prince of Qin's residence today?" Mei Xiyuan dared to approach Xuan Yuanhan and ask, seeing that he seemed to be in a good mood.

Unexpectedly, upon hearing her voice, Xuan Yuanhan suddenly stopped and turned slightly to face Mei Xiyuan, staring intently into her eyes for the first time.

However, he gave her an extremely stern look and said, "I'm warning you again, and this is the second time. I don't want this warning to come a third time. So, you'd better remember this. From now on, I will absolutely not allow you to act recklessly or make decisions on your own regarding anything concerning the Qin Prince's Mansion. I hope you'll behave yourself."

After saying that, Xuan Yuanhan immediately turned around and walked away quickly. As soon as he left the palace gate, he and his deputy general Cheng Liang jumped onto their horses and rode back to their residence.

Mei Xiyuan stood there, stunned for a long time, unable to react: just moments ago, Xuan Yuanhan had been in a good mood with a smile on his face; just moments ago, in Fenghua Palace, he had looked at her with unusual favor; just moments ago, she had helped Xuan Yuanhan bring the woman he desired into the Qin Prince's mansion...

But why? Why did he treat her like this in the blink of an eye? Everything she did was clearly according to his wishes, so why? Why did everything she did and said become, in his eyes, reckless and arbitrary? And why was she even lectured and told to watch herself?

She was an extremely proud and noble princess of Dongning Kingdom, yet he had repeatedly scorned and reprimanded her. As Mei Xiyuan thought about it, she stood there trembling with anger.

If she weren't currently in the palace and it were impossible to predict what she might do to vent her anger, she probably would have wanted to kill someone right now; she was extremely furious.

"Xuanyuan Han, you just wait, one day I will make you regret it..." Mei Xiyuan muttered angrily to herself.

At this moment, Granny Zhao stepped forward and asked with a puzzled look, "Your Highness, with such a good opportunity, why didn't you let that Princess of Western Qin take that ugly girl away?"

Mei Xiyuan looked in the direction Xuan Yuanhan had left, and sneered meaningfully, "Hmph, do you think our Prince Qin would let her go so easily...?"

"Your Highness, didn't the Princess Consort help you get Yi Shangyun from the palace to the Prince of Qin's residence? Why is Your Highness still...?" Cheng Liang asked, puzzled.

"Hmph, I'm afraid Mei Xiyuan isn't so kind. This woman is extremely cunning. From now on, have your men strengthen the defenses of the palace. If I'm not mistaken, Dongning Kingdom definitely has a conspiracy in this marriage alliance. How could such a wealthy and powerful country give away a real princess to my Western Qin for no reason?" The ever-thoughtful Xuanyuan Han carefully analyzed and instructed Cheng Liang.

Cheng Liang chuckled and said, "What's impossible about that? My Western Qin is no less impressive. Besides, who in the world doesn't know that the King of Western Qin is brave and mighty? Your Highness's reputation is renowned throughout the world and fills the heavens with praise..."

Cheng Liang spoke eloquently about his master Xuan Yuanhan's bravery, but just as he was about to continue, Xuan Yuanhan cast a chilling glance at him, causing Cheng Liang to immediately shut his mouth. He then respectfully bowed and accepted the order, saying, "Your subordinate obeys."

Only then did Xuan Yuanhan withdraw his piercing gaze. But he immediately became worried again. Why did Mei Xiyuan want Yi Shangyun to enter the Qin Prince's mansion as her physician? He didn't believe Mei Xiyuan truly had the magnanimity and courage to bring a woman into his household, even though he secretly hoped Yi Shangyun could stay by his side.

Cheng Liang was about to leave the main hall when Xuan Yuanhan suddenly ordered, "Immediately send men throughout the entire Lingkong to find renowned physicians and sorcerers. Anyone who can cure Yi Yaonu's leg ailment will be richly rewarded. I don't want the Qin Prince's mansion to have a lame female healer in the future."

Cheng Liang looked up and was taken aback, thinking, "If you care, just say so. Why come up with such a high-sounding reason and say such unpleasant things?"

Having just been reprimanded, he absolutely did not want to be scolded again, so he replied, "Yes, I will do it right away," and then retreated with a helpless expression.

......

Time flies, and it's already December, almost the end of the year. With Lunar New Year's Eve approaching, the weather is getting colder and colder.

Since being forced to kneel in the snow on that winter night, despite having recovered remarkably well thanks to Xuan Yuanhan's behind-the-scenes arrangements and protection, Yi Shangyun's leg ailment still flares up in this cold and damp weather.

She was sitting on the couch, massaging her aching knees, when she suddenly heard a commotion outside. She slowly got up to go out and find out what was going on.

"Hurry up, hurry up, everyone be quick!"

"You, quickly go and get the medicine prepared according to this prescription."

"And you, quickly clean and prepare the special medicine pot, and once the medicine is ready, decoct it and send it to Donghua Palace."

......

As soon as Yi Shangyun stepped out, she saw Dingxiang hurriedly making arrangements.

Her legs and feet were still unsteady at times, but Dingxiang had been able to help her with many things these past few days and was making rapid progress. It was estimated that once Yi Shangyun left the palace for the Prince of Qin's residence, the job of the chief medicine girl would most likely be handed over to her. Yi Shangyun was very gratified by this, as it would allow her to leave with much more peace of mind.

Yi Shangyun watched Dingxiang assigning tasks methodically and became somewhat fascinated. Suddenly, she came to her senses, frowned slightly, and murmured, "Donghua Palace." So she went up to ask Dingxiang.

As soon as Dingxiang saw Yun come out, she hurriedly said, "Yun'er, the weather is cold and damp today. Didn't I tell you to stay inside? Don't worry, I'm here. If there's any problem, I'll report to you."

"It's alright, you're not that delicate. I just heard you mention Donghua Palace, what is Donghua Palace...?" Yi Shangyun asked curiously.

Dingxiang then realized that Yi Shangyun had entered the palace late and knew nothing about Donghua Palace. She explained in detail, "Yun'er, you don't know this, but Donghua Palace is the palace of the current Crown Prince. The Crown Prince is young, not even 10 years old. In recent years, he has been traveling to various countries of the Lingkong Continent with Grand Tutor Wen, so he is not in the palace and therefore does not need the Imperial Pharmacy's services. This time, it is because the Crown Prince has been away for too long, not returning for several years. The Empress Dowager and the Empress miss him very much, so they summoned him back to the palace to celebrate the New Year together and ease their longing."

Yi Shangyun finally understood and immediately asked jokingly, "Then how come the Crown Prince, who is so delicate, fell ill as soon as he returned to the palace after traveling abroad? Could it be that he was used to the climate and environment outside for so long and is now suffering from acclimatization problems?"

Dingxiang immediately became tense, lowering her voice to whisper in Yi Shangyun's ear, "You've come at the perfect time! I was just about to report to you. I heard from Ziyan, a maid in Donghua Palace, that the Crown Prince didn't fall ill immediately upon returning to the palace; he contracted the illness on the way back. I heard he's been feeling fatigued and has headaches for several days, and a few days ago he suddenly developed a high fever, which caused him to have convulsions. We thought it was just a cold and gave him some Ma Huang Li Zhong Tang (Ephedra and Ginseng Decoction for Regulating the Middle Jiao). Grand Tutor Wen originally intended to take the Crown Prince to stop at inns along the way for medical treatment, but because the Crown Prince was eager to return to the palace, he insisted on rushing back first. Who would have thought that today, as soon as we arrived, Physician Zhang went to examine him and said that the Crown Prince had contracted chickenpox, and the rash had already started to appear. The Empress Dowager and the Empress are very worried, and the Emperor is furious. Grand Tutor Wen was severely reprimanded and is now confined to his residence, forbidden from leaving unless summoned."

Yi Shangyun exclaimed in surprise, "Chickenpox?"

She frantically recalled what she had learned: "fatigue, headache for several days, high fever and convulsions, rash..."

Dingxiang: "Yes, thankfully it was chickenpox, and only because the Crown Prince insisted on pleading for the Grand Tutor was he only lightly confined to his quarters. If it had been something else... I'm afraid Grand Tutor Wen would definitely have lost his head. The Crown Prince is the only heir to the Western Qin Kingdom; if anything were to happen to him, the consequences would be unimaginable."

At this moment, the young medicine girl had already brought the prepared medicine over to the medicine girl who was decocting it. Yi Shangyun hurriedly went over and said, "Let me see the prescription." The young medicine girl hurriedly stretched out her hand and respectfully presented the prescription.

Yi Shangyun took it and carefully examined the following ingredients: "Mulberry leaves, chrysanthemum, burdock seeds, apricot kernels, red peony root, isatis root, honeysuckle, forsythia, raw coix seed, plantain seed, and reed rhizome."

“It’s Sangju Drink,” Yi Shangyun murmured after reading it, but thinking about the symptoms Dingxiang had just described, she suddenly frowned deeply, looking thoughtful.

Then she said, "Dingxiang, let me know when the medicine is ready, and I'll go with you to take a look."

"Yun'er, is there something wrong with this medicine?" Dingxiang asked suspiciously.

"Let's go and see first," Yi Shangyun replied with a similarly puzzled expression. But in her heart, she hoped it wasn't what she feared; for now, she could only wait to see the Crown Prince in person before making a decision.

Soon, the two of them rushed to the Crown Prince's Palace in Donghua Palace with the medicine.

"Hurry up and give the medicine to the Crown Prince!" The two were startled by Emperor Jing's furious shout as soon as they entered the room. Dingxiang was even more frightened when she heard it, and her hands holding the wooden tray trembled.

Upon seeing this, Yi Shangyun immediately reached out and picked up the medicine bowl from the wooden tray in Dingxiang's hand, and calmly walked towards the Crown Prince's sickbed.

Upon arriving, one sees a 10-year-old boy lying on the sickbed, who, despite being ill, is still remarkably handsome and possesses an extraordinary air.

The boy on the sickbed had a youthful, angular face, thick black eyebrows, and thin lips beneath a high nose. Although his face was covered with pimples from his illness, he still exuded an air of nobility.

I often hear older people in the 21st century say that people with thin lips must be very good at talking. I thought to myself, this boy in front of me must be a clever child.

After a brief examination, Yi Shangyun slowly sat down by the sickbed, picked up a spoon and was about to feed him medicine when she suddenly noticed that the child in front of her was shivering. Only then did she notice that the distribution of his rash seemed a bit strange.

Although it was the dead of winter, the Crown Prince's palace in Donghua Palace was extremely well-insulated, yet he was still shivering.

"Could it really be..." Yi Shangyun murmured, then reached out and grabbed the prince's arm to examine it closely. He saw that the arm exposed under the long sleeve was covered with dense red papules.

She immediately put down the medicine bowl in her hand, and hurriedly pulled up her other hand to confirm that it was the same. Then she quickly untied the boy's clothes and saw that there were very few red rashes on his abdomen and chest.

As a top student in the domestic medical field in the 21st century, how could she not know what this centrifugally distributed rash was?

Yi Shangyun pondered for a moment, then frowned deeply, turned to Zhang Zhiyuan, the chief physician of the Imperial Medical Academy, and said urgently...