My father, Li Shimin, requests Your Majesty to become the Retired Emperor.

"Yes!" Xu Hui said.

"If I'm not mistaken, the Crown Prince should be in Tibet," Cai Xiang said.

How do you know?

"He had a very good relationship with Princess Wencheng and her brother, and he will definitely attend Princess Wencheng's wedding."

Xu Hui listened and nodded, agreeing with Cai Xiang's reasoning: "Then, who should we send to find the Crown Prince?"

"Let Du He go."

"Du He is an upright man who can distinguish right from wrong. Sending him to find the Crown Prince should be fine," Cai Xiang suggested.

Xu Hui was somewhat worried: "Tibet is far from Chang'an. By the time Du He arrives in Tibet, we don't know if he will be able to see the Crown Prince."

Even if he met the Crown Prince, where would the Crown Prince find Sun Simiao?

"By the time we bring Sun Simiao back, the Empress's condition will likely be even more serious."

"It's alright. Last time, the Crown Prince brought back some snow lingzhi from Japan. I'll boil some snow lingzhi into a soup and give it to the Empress. That should keep her safe for now." As Cai Xiang said this, she took out a few leaves of snow lingzhi from the document drawer.

In fact, these snow lingzhi mushrooms are very precious.

In the past, Li Chengan used the leaves of the snow lingzhi to make a soup, which saved the life of King Shuming.

"In that case, let's do as you say. You take good care of the Empress, and I'll go find Du He now."

"I understand, don't worry."

Xu Hui found Du He and told him what had happened.

Du He was also shocked when he heard this.

In fact, Du He didn't understand why Li Shimin deposed Li Chengqian from the position of crown prince.

Du He was the second son of Du Ruhui and held the position of Imperial Attendant.

Princess Chengyang, the daughter of Li Shimin and Empress Zhangsun, married him.

This shows that Li Shimin had a deep affection for the Du family, and therefore treated them well.

To others, Du He was born into the highest nobility and was the emperor's son-in-law, so his future was limitless.

If Du He follows the rules and behaves honestly, he will surely achieve great things in the future.

However, Du He never took any of this to heart.

He often discussed the state of the world with Li Chengqian, and he was impressed by Li Chengqian's talent and wisdom.

"Yes, we didn't want this to happen either."

But what's done is done, and we need to find a way to face it.

"So, what do you need me to do?"

Xu Hui looked worried: "The most urgent task is to find a way to treat Empress Zhangsun as soon as possible. If we delay, Empress Zhangsun's condition will gradually worsen."

Unfortunately, the imperial physicians at the Imperial Hospital were all helpless in treating Empress Zhangsun's condition.

Therefore, we thought of the legendary physician Sun Simiao. Now, perhaps only Sun Simiao could save Empress Zhangsun.

However, we do not know where Sun Simiao is now.

Moreover, Sun Simiao had an eccentric temperament; he might not even listen to ordinary people who went to him.

Therefore, we would like to ask you to find Li Chengan, and after finding the Crown Prince, explain the situation to him and ask him to invite Sun Simiao to treat the Empress's illness.

Upon hearing this, Du He understood: "The Empress's condition is so serious; the cause is probably still with the Emperor."

If the Emperor doesn't change his attitude, the Empress's illness will likely be difficult to cure.

"Regarding this matter, I will gradually persuade the Emperor to show more concern for Empress Zhangsun and to punish Li Chenggan less."

"Li Chengqian is the most outstanding crown prince of our Tang Dynasty. Our Tang Dynasty cannot be without Li Chengqian."