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The man in front of her was about fifty years old, with gray hair on his temples. He exuded an elegant and intellectual aura. He adjusted his reading glasses, and his wise eyes penetrated the lenses and projected onto Yi Jie.

"Are you Yi Jie? I haven't had any students for a long time, but Academician Wu has been very kind to me, so I should help her, but I still have to follow the necessary procedures. If your qualifications are too poor, I would rather annoy Academician Wu than teach you, because it would harm you. Also, who is this? I only agreed to teach one person."

"Teacher, you don't have to worry about me. Just teach Xiao Jie. I'm just here to accompany her." Pei Yanan explained.

After listening to what Teacher Xun said, Yi Jie respected him even more.

"Teacher Xun, just follow the process. I understand."

Teacher Xun was very satisfied with Yi Jie's understanding, and continued: "I heard that you have only been involved in the competition for less than a month, so your foundation must be very weak. The preliminary round will be in half a month, so we have to strengthen our training during this period. The practice we need to do is huge. You come here at 8 o'clock in the morning and can only go back at 9 o'clock in the evening. Can you persist?"

Yi Jie had already prepared for the hard work, so she naturally showed that she could do it immediately.

"Okay, then come with me and do a set of questions I gave you first, so I can see where to start." Teacher Xun stood up from the sofa and took Yi Jie to the study room. Pei Yanan stayed where she was obediently, as she didn't need to do any questions.

After pushing open the door and entering, several rows of bookshelves came into view, filled with books neatly stacked. On the wall were many mathematical formulas and extremely complex geometric diagrams that Yi Jie could not understand. Various mathematical models were piled on one side, and judging from the degree of wear and tear on them, it was clear that the owner used them frequently.

Yi Jie was truly amazed. This was the most mathematical room she had ever been to since she was a child.

Teacher Xun didn't give Yi Jie too much time. He found the test paper from the desk and handed it to Yi Jie, "Go over there and do it."

Yi Jie took the test paper and walked to the student desk that should have been newly placed by Teacher Xun, picked up a pen and began to look at the questions. Yi Jie's quick entry into the state made Teacher Xun nod secretly, and he was more satisfied with her.

All the questions on the test paper were handwritten by Teacher Xun. His handwriting was vigorous and powerful, like pine and cypress. It was true that his handwriting reflected his personality.

Even though Yi Jie had the buff of a master of question-solving, it was not easy to do this set of questions. Having ideas was one thing, but the large amount of calculations and the many traps in the questions made Yi Jie overturn and start over several times. In addition, it also covered some of Yi Jie's knowledge blind spots, so she could only skip them to avoid wasting time.

It took three hours, which was the longest time Yi Jie had ever spent on a math test.

"Finished?" Teacher Xun was a little surprised. He had expected Yi Jie to write for at least four hours. It seemed that her foundation was better than he expected.

“There were a few questions that I didn’t understand the concepts of, so I didn’t write them down.” Yi Jie answered truthfully.

Teacher Xun took a quick look and said, "You have accomplished so much, which is much better than I expected. I will mark it for you first and then explain the questions in the afternoon."

It was already one o'clock in the afternoon, and Yi Jie's stomach was rumbling. Seeing Teacher Xun seriously marking the papers, she mustered up the courage to ask.

"Teacher, how about we have a meal first?"

Teacher Xun slowly raised his head and realized that Yi Jie and the others were just children who were still growing up. Unlike him, he would sometimes work on a problem for two or three days without sleep or food.

"Ah, there are some meals I packed in the refrigerator, just heat them up." After saying that, Teacher Xun lowered her head and started correcting the test papers. Yi Jie could only walk out of the study room helplessly and think of a way to prepare lunch.

When she opened the refrigerator, she saw several take-away boxes in the empty refrigerator. Yi Jie lifted the lid and smelled the food, and it was all rotten. She had no idea when the dishes were ordered.

Pei Yanan whispered: "Don't these great scholars need to eat? Absolutely."

"Maybe mathematics is both Mr. Xun's spiritual food and his love. I admire people like them who devote their whole lives to what they love." Yi Jie noticed that there was no hostess as soon as she entered the house.

"That's respectable. What shall we eat, Xiao Jie?" Pei Yanan is a soldier and his physical strength is consumed quickly. His stomach is rumbling at this moment.

"Xiao Nan, go outside and buy some vegetables. I'll clean up the kitchen." Yi Jie looked at the messy kitchen, which was a far cry from the clean and tidy study. Cleaning it up was a big project.

"Okay," Pei Yanan planned to finish the shopping quickly and come back to help Yi Jie clean up.

After working hard for a while, Pei Yanan came back carrying big and small bags.

"Wow, Xiao Jie, you're really fast. I was thinking of coming back to help you."

"That's right. Okay, let's prepare the food quickly. I'm so hungry. I have to do mental work in the morning, physical work at noon, and brain work again in the afternoon. I'm going to cry." Yi Jie pouted.

Pei Yanan took over Yi Jie's task with a distressed look on her face and told her to go and have a rest and start cooking later.

"Yi Jie, I have corrected your grades. Have you finished your meal?" Teacher Xun walked out of the study and smelled a strong aroma of food.

When I looked over, I saw Yi Jie wearing an apron and frying vegetables in front of the stove.

"Teacher Xun, please wait a minute. You can eat soon." Pei Yanan pulled out the stool in front of the table and motioned for him to sit down.

Teacher Xun sat down in a daze. It was the first time that a student cooked for him.

When the three dishes and one soup were served, Teacher Xun looked at the hot food and the two little girls beside him, and his chest felt sore and swollen.

"Teacher, throw away the food in the refrigerator when it goes bad. Don't keep it and eat it, or you'll get a stomachache. From now on, I'll buy fresh vegetables here every day when I come to class, and we'll cook our own meals at noon and in the evening." Yi Jie served a bowl of soup to Teacher Xun.

After taking a few sips, Mr. Xun relaxed his frown and said to Pei Yanan calmly, "You should come to class together in the future."

Pei Yanan's face changed in shock and he was about to refuse.

"Why, you don't want to?" Teacher Xun's tone contained the irresistible authority that only belongs to a teacher.

"No, I am willing." Pei Yanan agreed with grievance. It was an unexpected disaster.

Yi Jie couldn't help laughing, thinking that it must be Teacher Xun who was thanking them for their hard work in preparing the meal, so he made an exception. It was this reward that made Xiao Nan so miserable.

The home-cooked meals that he hadn't tasted for a long time whetted Mr. Xun's appetite. He ate in a very elegant manner, but his mouth moved very fast.

After finishing all the food, Xiao Nan took the initiative to wash the dishes, thinking that he could avoid studying. But before entering the study room, Teacher Xun said, "Come in as soon as you finish cleaning up, and check everything out."

Yi Jie looked at the depressed Xiao Nan with sympathy, and followed him into the study room with a gloating look on her face.

The happy time did not last long. Teacher Xun showed his strict teacher aura and criticized Yi Jie's test paper.

"I set ten traps, and you stepped on half of them. You also made a lot of mistakes in your calculations. What's there to be happy about? With your current level, it's hard for you to even participate in the CMO preliminaries. Don't think that having a solution is omnipotent. It only shows that you are smart. Mathematics is a rigorous subject, and having a smart mind won't help you much."

Yi Jie took the test paper timidly and saw the eye-catching score of 57. She didn't even pass the test, so she quickly stopped thinking about making fun of Xiao Nan.

She didn't notice that the corners of Teacher Xun's mouth were slightly raised. In fact, Yi Jie's performance was quite good. She was definitely a talented person. You should know that this set of questions was as difficult as the CMO finals. But the arrogant will be defeated, so he chose to teach her to completely wipe out her impetuous spirit.

She listened attentively to Teacher Xun's explanation of the questions and took notes. She was even more focused when doing the review exercises. When Xiaonan came into the study room, she didn't even notice that she was assigned to take the exam. She was completely absorbed in doing the questions.

"Not bad, you have made some progress. You can take it and correct it yourself. For this question, refer to the analogy question type I told you about. Think about it carefully." Teacher Xun handed Yi Jie the exercise paper with only one wrong question. Yi Jie breathed a sigh of relief, finally it was not so outrageous that she made a mistake.

"It's a mess, you have no brains! I've told you so many times, this is the simplest preliminary test, and you still got it wrong so many times!" Teacher Xun scolded loudly, which was rare, attracting Yi Jie's attention. Teacher Xun was constantly marking crosses on Pei Yanan's paper, and his face became more and more gloomy.

Pei Yanan bit the tip of the pen, wanting to cry but without tears. Please save the child, I'm just going through the motions!

"Since you have got this hard-earned opportunity to participate in the competition, no matter what the reason is, you must study hard. Mathematics cannot be treated casually! From now on, study hard like Xiao Jie every day. I will be really ashamed if you can't even pass the preliminary round! Do whatever you want after the test, but concentrate before the test!" Teacher Xun looked like smoke was coming out of his head.

Pei Yanan said yes in a low voice, took the test paper tremblingly, and leaned over the table, racking his brains to correct it.

After a day's classes ended, Yi Jie dragged the exhausted Pei Yanan out of the house. Teacher Xun was still telling them behind their backs not to be late, so Yi Jie made a promise immediately.

The two guards at the door were still standing upright. One of them rushed here immediately after seeing He Chengan off.

"Colonel Yi, Major Pei!" The two saluted. They had a great impression of their current superiors. Today's lunch and dinner were made by them. The hot meals were delicious.

"Okay, okay, let's go home." Yi Jie was still not used to being greeted so formally by her subordinates.

"I swear this is the most difficult mission I have ever done. I would rather go to the battlefield seven or eight times than do a set of papers given by Teacher Xun!" Pei Yanan wailed in the car, causing the guard driving the car to laugh.

"Teacher Xun is doing this for your own good. Besides, it won't hurt to learn more. We must not only be the top student among the officers, but also the best one!"

"Thank you for the invitation. I just want to be an ordinary top student. I'll give you this blessing." Pei Yanan rubbed his brain which had been overused today.

"Then go and talk to Teacher Xun yourself! See if he agrees." Yi Jie stabbed with the knife without any hesitation.

Pei Yanan looked desperate as she raised her head and stared at the roof of the car. She was a military pioneer who was successfully elected as a major at the age of 20, but now she was suffering from the torture of mathematics. It was simply inhumane!