Wu Qing doesn't believe in evil.

She shook her head, picked up the pen firmly, and started drawing vigorously.

This picture has a big circle inside a small circle, and the small circle has an even smaller circle inside it.

The outermost curve stretches outward abruptly, breaking the original harmony and being particularly eye-catching.

Wu Qing's eyes were burning.

She pointed to the most abrupt curved part on the upper right side of the pattern and asked, "Your Majesty, what is the terrain here?"

Prince Ding observed for a second and immediately gave the correct answer: "The curved part of the line bulges downward, which should be the ridge."

Wu Qing was stunned: [It really can’t be difficult for him. 】

She picked up the pen again and drew three overlapping circles.

Wu Qing pointed at the intersection of the circles and asked, "What is the terrain here?"

Prince Ding said calmly without any hesitation: "The lines intersect here, which means the terrain is steep. It should be a cliff."

Wu Qing covered his face and was right again.

This is all she remembered, and he learned it all!

Prince Ding didn't even need her to teach him, he completely understood what she meant and was able to apply it to other situations.

The girl put her hands in front of her and her shoulders shook.

Prince Ding asked in confusion: "Why did you cover your face with your hands? Is there something wrong?"

Wu Qing replied with a trembling voice: "Nothing. I am just moved by the prince's wisdom and want to cry."

Prince Ding choked up: "There's no need to do this..."

The eldest prince also spoke highly of the contour map.

He sincerely admired: "Your painting is really a masterpiece. It can carefully outline the ups and downs and veins of mountains and rivers. It is concise yet accurate. At a glance, the direction of the terrain is clearly displayed before our eyes."

But this diagram also has many limitations.

For example, determining the height of each mountain requires a lot of manpower and resources. This is an extremely tedious and time-consuming project.

For example, for those mountains with complex and rugged terrain, this kind of topographic map may be difficult to present perfectly.

The eldest prince understood in his heart that this was the reason why Concubine Ji dared to use this painting method.

The second prince glared: "..."

Wait, something seems wrong.

He tugged at the eldest prince's sleeve and asked in a low voice, "Do you understand?"

The eldest prince nodded, confirming his brother's question.

“It’s very simple.”

He then picked up a charcoal pencil, and soon a simple topographic map appeared on the paper.

The eldest prince drew three closely connected concentric circles, like three jade plates of different sizes.

From the inside to the outside of the concentric circles, he marked one hundred, two hundred, and three hundred on the lines respectively.

“This diagram represents a mountain.”

After saying this, he drew three more concentric circles.

This time it was the opposite. From the inside out, he marked the concentric circles at 300, 200, and 100 respectively.

“And this diagram represents the basin.”

The eldest prince spread his hands and said casually, "It's very simple. It's easy to do."

The second prince blinked twice, curled his lips and said, "If you don't believe me, you must be guessing."

What are you guessing?

Upon hearing this, Wu Qing came over to take a look.

She was pleasantly surprised and said, "Hey, these two pictures are very beautiful, and they also correctly describe the terrain. It seems that Your Highness has already learned this way of drawing."

The eldest prince responded to Wu Qing with an obedient smile.

Now Prince Ding and the eldest prince have both learned how to read topographic maps.

Wu Qing then urged the Second Prince, "You are the only one who hasn't painted yet. Come and paint for everyone to see."

The second prince had empty eyes and didn't know what to say.

It's over, he didn't understand anything.

How can a high mountain be represented by several circles?

Were the three of them teaming up to tease him?

Wu Qing was amused by his expression.

She recalled the days dominated by advanced math classes.

The professor on the stage poked the blackboard with chalk, spit flew everywhere, and spoke excitedly.

At that time, she and her roommates maintained the same expression as the Second Prince at this moment.

——Hair was disheveled, eyes were dull, he was incoherent, and fell asleep.

Wu Qing's mouth corners lifted involuntarily, and he had a bad idea.

She wants to regain the sense of accomplishment she lost from Prince Ding from the Second Prince!

She softened her voice and said kindly, "Your Highness, you don't understand this picture? No problem, I'll teach you."

The second prince's teeth chattered and he suddenly felt eerie.

"Actually... I already understand." He explained hastily, trying to get rid of this sudden uneasiness.

But the others had no intention of letting him go.

The eldest prince ignored his brother's words and turned to Prince Ding and said, "Then let the noble teach my second brother. My eighth uncle and I will start drawing the picture of Yushan first."

Prince Ding nodded: "Okay."

The three of them decided on the teaching arrangements in this way. The Second Prince had no place to interrupt and actually felt like he was being left out.

Wu Qing exchanged places with the eldest prince.

She walked over to the second prince and said with a smile, "I will describe the mountain verbally, and then you draw the picture."

"If you can finish the painting, it means you have learned it."

Second Prince:?

Wu Qing tapped his fingers on the drawing table, imagining the appearance of the mountain in his mind, and said, "Then let's start with the basics... Draw a mountain that is no more than 500 feet high, with three peaks and a narrow basin between the peaks."

"How do I draw this?!" The second prince's eyes widened.

Wu Qing joked, "Didn't your highness just say that you understood? If you understand, then drawing this picture shouldn't be a problem, right?"

The expression on the second prince's face changed constantly.

After a moment, he lowered his head and admitted his mistake: "My Lord, I said something wrong. I didn't understand it."

Wu Qing did not blame him.

"It doesn't matter, we can start over again."

Wu Qing said nonchalantly, "If you don't understand it, then you don't understand it. Just repeat it a few more times and you will become familiar with it."

The second prince raised his head slightly, his eyes filled with mixed emotions, as if he was thinking about something.

"What's wrong? Are you shy?"

Wu Qing patted the child on the shoulder and said, "Relax, it's not shameful if you can't learn it."

"I will draw a three-dimensional picture for you, and then add a corresponding two-dimensional picture. By comparing the two, perhaps you will understand it more easily. Please wait for a moment."

Wu Qing calmed down to paint and devoted her life to painting skills.

Prince Ding is such a good painter, so she can’t be too bad, right?

For a moment, the only sound in the studio was the sound of charcoal touching paper.

Everyone was painting. The Second Prince was absent-minded and wanted to talk to Wu Qing.

He stared at the painting and said softly, "Actually, what I lack most right now is time. I don't have time to learn one thing multiple times."

"If you don't understand it the first time, you will never understand it again. Not everyone is like you, willing to patiently explain it to me until I understand it."

How is that possible?

Wu Qing sketched the outline of the mountain and casually asked him, "So do you want time to go faster or slower?"

The second prince shook his head and said, "The speed of time doesn't mean much to me. If I could really control time, I would just want time to stop for everyone except me."

Wu Qing's brushstrokes paused slightly on the paper.

"...What are you going to do?" She asked him, turning her head.

"Studying? What else can you do?" the second prince asked her.

He was born a few years later than his elder brother, so he had to work harder to gain a foothold in the court.

If he didn't spend more time and effort to build up personal connections and win over the civil officials in the court, how could he defeat his eldest brother, who was the legitimate son?

Wu Qing wiped the sweat off his face and secretly breathed a sigh of relief.

[Fortunately, it was just for study. The child is really kind, I was just overthinking it.]

She drove out of her mind the unrighteous thoughts of killing her brother, killing her father, and usurping the throne.

The second prince sighed softly, his eyes penetrating the clouds outside the window.

"If I have to say it, deep down in my heart, I do hope that time will pass faster."

He longed to grow up quickly, have his own mansion, and escape the scrutiny of his father.

Wu Qing listened quietly at the side.

When she had finished describing the shadows in the valley, she said, "In the future, don't ever mention wishing time would fly again."

The second prince frowned slightly.

Wu Qing changed his pen and said slowly, "When you say that, it sounds like you wish your father would... die soon."