"What?" Yu Chaoyang couldn't believe it.

"If the prince is really incapable of carrying the responsibilities, the clan members will ask my father to select another heir to train. Even the emperor will make this request. The Shangguan family's century-old foundation cannot be destroyed by a prince who is useless."

She thought that everything would be fine if she became the crown prince.

It turns out that even the emperor is keeping an eye on the prince of the palace.

"Is it because of this iron box?" Yu Chaoyang sobered up a little from his excitement and suddenly thought of this possibility.

"That's right. It's because of this iron box. It concerns the stability of the entire Wei Dynasty. The Canglan Kingdom in the north and the Nanshu Kingdom in the southwest are both afraid of this iron box. They are afraid that someone in our Wei Dynasty will open this iron box."

"Oh? Why?" Yu Chaoyang was even more confused.

In her previous life, she had never touched this iron box. It was not given to the prince by heaven, but was given to her after the prince got married.

Later she learned that the iron box was very important to the palace, and everyone wanted to open it, but no one could open it until her death.

Because of her exchange marriage, the prince gave her the title of crown prince and this iron box on the same day.

"The contents of this iron box can shock the two countries, but I don't know what is inside. This iron box was left by the third generation Prince Rong and Princess Rong.

He left a will that the descendants of the Shangguan family must protect it. If they meet a destined person, they can open it. And this destined person must be a member of the Shangguan family, and it must not be allowed to be obtained by other countries. "

Shangguan Zishu explained.

But Yu Chaoyang was still confused after hearing it, and didn't know what was inside. But it had such a great effect.

"If it can't be opened, it's useless."

"Yes. But other countries don't know when we can open.

If we open it right after they start a war, then Wei will be able to win the war with the contents of the iron box.

So over the years, there have been constant small frictions between the three countries, but no large-scale war has ever occurred.”

"Let's try to see if we can open it now." Yu Chaoyang was very excited.

Just when they were about to give it a try, the old lady and Concubine Luo arrived.

"Greetings, old lady, concubine." The two of them immediately greeted each other.

"Well, Zishu, from today on, you are the prince. Yes, yes, grandma has been looking forward to this day, and today finally your wish has come true." The old lady smiled kindly and called herself grandmother.

She has called herself this countless times, and everyone is used to it. No one will point out that it is against the rules for her to call herself this.

But Shangguan Zishu never dared to speak directly to her grandmother.

"My son is now the crown prince, and it's worth it that your mother has worked hard to raise you for so many years." Concubine Luo started to cry as she spoke.

No one can understand her suffering.

Back then, I entered the palace by improper means and never received any mercy from the prince.

If she didn't have a son, she didn't know how she would live. She drank this bitter cup of wine for 19 years. Fortunately, the prince at least recognized this son and now gave him such an important position as the crown prince.

She was happy and excited.

So what if the princess is the legitimate mistress? She still has to live by her son's mood.

Thinking of this, she felt finally proud.

"Why are you crying on such a happy day? If you want to cry, go cry outside." The old lady scolded.

"Madam, I am just happy. I am crying for joy." Concubine Luo quickly took a handkerchief to wipe her eyes.

"Follow your father and study hard. Don't bring shame to the palace. Open this iron box as much as you can.

If any of you can open it, you will be a meritorious official of the Shangguan family. You can even be a meritorious official of the Wei Dynasty."

The old lady said as she looked at the iron box still on the table.

"We were just about to give it a try. This thing was always in Father's study. My eldest brother tried countless times to open it but failed. I don't know if we will have the luck."

Shangguan Zishu didn't have much confidence either.

Several generations have been unable to open it, so he might not have the ability to do so. He was afraid that the old lady and his mother would have too high expectations.

"Our prince is the smartest and will definitely be able to open it." The old lady encouraged.

The four of them sat down together and began to study.

It is a square cube, fitting perfectly together. If you don't look carefully, you would think it is a whole.

There is a picture at the top, which is also colored. It is a blooming red plum blossom.

There is a bulge on the front, as thick as a little finger and four inches long.

But there is no real lock. Instead, there are small indentations. Under each indentation is a small round wheel with teeth around it.

If Yu Zheng could recognize it at a glance, this would be the ton code lock.

But these four people didn't know each other.

"Prince, there's no lock at all, how do I open it?" Yu Chaoyang was puzzled.

The others had all seen it, except her.

"This combination lock is made by turning these small round wheels. Each time you turn it, a number will appear. As long as the number is correct, it can be opened. But for so many years, no one has dialed the combination correctly."

"There are fourteen numbers in total. How many numbers are there? Ten trillion in sequence." Yu Chaoyang's shoulders collapsed when he thought of so many numbers.

It means dialing the numbers non-stop all year round, and I don’t know how many years it will take.

The ambition that I had at the beginning suddenly wilted.

But maybe she's lucky?

What if I just dial a random number and it happens to be the ton code?

Yu Chaoyang moved the box in front of himself and began to turn the round teeth.

I tried a number at random, and there was no response at all.

She changed the number, but still no response.

I tried dozens of numbers and got no response.

Shangguan Zishu also took it and continued to try, but there was no response at all.

When the old lady saw that the two young men had been trying for a long time without any success, she also tried it.

She had only seen it in the old prince's study before, and had never turned it herself.

This was the first time she had such close contact with Tian in all the years she had been married into the palace.

But she tried several numbers and nothing happened.

Concubine Luo was also curious and tried it, but it was useless.

The initial excitement was put to a cold shower.

"Well, this is not something that can be opened in just a few tries. Several generations have failed to open it. You just got it today and you are not familiar with it yet.

Don't be discouraged, try more in the future, maybe it will open one day? "The old lady comforted.

"Yes, we'll try more in the future."

"Zishu, now that you are the prince, you should help your uncle more in the future. Your uncle has loved you a lot over the years, and your brother Zifeng should also have something to do. He is half a year older than you."

She didn't care whether the box could be opened or not. The key point was that the position of the crown prince was in Zishu's hands, and he would be the Prince Rong in the future. This was her greatest wish.

"Prince, can't you just smash it open? Or use some other tool to pry it open?" Yu Chaoyang dialed a few more numbers, becoming a little impatient.

"cannot."

“Why?” Yu Chaoyang was puzzled.

There are just things in it, so as long as we can take them out, it's fine.