She married a dying prince and she won three babies.

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

"If the Crown Prince is truly incapable of carrying the responsibilities, the clan members will ask Father to select and train another heir. Even the Emperor would make this request. The Shangguan family's century-old foundation cannot be destroyed by a useless Crown Prince."

She thought that everything would be fine as long as 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 Great Wei. The Canglan Kingdom in the north and the Nanshu Kingdom in the southwest are both wary of this iron box. They are afraid that someone in the Great Wei will open it."

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

In her previous life, she had never touched this iron box, and it was not given to the prince today, but was given to him after he got married.

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

In this life, because of her exchange marriage, the prince gave her the throne of the crown prince and this iron box on the same day.

"The contents of this iron chest are enough to shock two nations. I don't know what's inside. This chest was left behind by the third generation Prince Rong and his wife.

He left a legacy, instructing the descendants of the Shangguan family to 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, not knowing 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 minor frictions between the three countries, but no large-scale war has 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 second old lady and Concubine Luo arrived.

"Greetings to the Second Madam, Consort Mother." The two of them immediately saluted.

"Well, Zishu, from today on, you are the prince. Good, good, grandma has been looking forward to this day, and today it finally came true." The second old lady smiled kindly and called herself grandmother.

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

But Shangguan Zishu never dared to call her grandmother directly.

"My son is now the prince, and it's worth it that your mother has worked so 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 wouldn't know how she would have managed to get by. She drank this bitter cup for nineteen years. Fortunately, the prince at least acknowledged this son and now gave him the important position of Crown Prince.

She was happy and excited.

So what if the princess is the legitimate mistress? She will still have to live her life according to her son's wishes.

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 second old lady scolded.

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

"From now on, follow your father and study hard. You must not bring shame to the palace. Open this iron box as much as you can."

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

The second 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 used to be kept in Father's study. My eldest brother tried countless times to open it but couldn't. I don't know if we'll have the same luck."

Shangguan Zishu didn't have much confidence either.

It had been impossible for generations to open it, so he might not have the ability to do so. He was afraid that the Second Madam and the Concubine's expectations were too high.

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

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

It is a perfect cube, fitting together perfectly. If you don't look closely, you might think it is a whole.

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

There is a ridge 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 Yuanzheng could recognize it at a glance, this would be the combination lock.

But these four people did not know each other.

"Prince, there is no lock at all. How do I open it?" Yu Chaoyang was very surprised.

The others had seen it, but she hadn't.

"It's called a combination lock. You turn these little wheels, and each time you turn them, a number appears. As long as the number is correct, it can be opened. But for all these years, no one has ever gotten the combination right."

"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 counting the days all year round, and I don’t know how many years it will take.

The initial ambition quickly faded.

But maybe she's lucky?

What if a random number you dial happens to be the password?

Yu Chaoyang moved the box in front of him and began to turn the round gears.

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

She changed the number, but still no response.

I tried dozens of numbers but got no response.

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

Seeing that the two young men had tried for a long time without success, the second old lady also tried it herself.

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

Today was the first time she had such close contact in all the years since she married into the palace.

But she tried several numbers, but nothing happened.

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

The initial excitement was poured with a bucket of cold water.

"Well, this isn't something you can open in just a few seconds. Several generations haven't been able to open it. You just got it today and you're not familiar with it yet.

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

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

"Zishu, now that you're the crown prince, you should support your second uncle. Over the years, your second uncle has loved you very much. And your brother Zifeng should also have something to do. He's half a year older than you."

She didn't care much about whether the box could be opened or not. The most important thing was that the throne of the crown prince fell into Zishu's hands and he would become 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 and became a little impatient.

"No."

"Why?" Yu Chaoyang didn't understand.

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