That night, the compliments and exclamations from around him kept lingering in Zhao Xiancai's ears.

However, Zhao Xiancai, who had gradually gotten used to it, didn't pay too much attention and just continued to write his thesis.

Although this paper is not very long, it is 15 pages even without the final citation. This cannot be completed in one night.

Moreover, other people in his dormitory also have to sleep at night, so it is impossible for Zhao Xiancai to stay in the dormitory all night writing papers, which will also affect his roommate's rest.

After getting up the next day, except for class time, Zhao Xiancai spent the rest of the time in the library writing this paper.

That afternoon, when Zhao Xiancai was writing a paper in the library, a girl holding several books in her hands glanced at Zhao Xiancai as she passed by. After that, she walked back and turned back.

And asked Zhao Xiancai: "Classmate, is there no one in this position?"

"No." Zhao Xiancai replied without turning his head.

After the girl sat down on the seat next to Zhao Xiancai, she secretly glanced at Zhao Xiancai a few more times, then she poked her head over and asked Zhao Xiancai in a low voice: "Senior, you are the mysterious person in Teacher Liu's class last time.

Bar?"

"Mysterious man? What mysterious man?"

It was only then that Zhao Xiancai noticed that there was an additional girl beside him, but Zhao Xiancai was confused as to what mysterious person the girl was talking about.

"Is it possible that this is a pick-up routine used by girls from Beijing University?"

Zhao Xiancai thought to himself after taking a look at the girl who was chatting with him.

He has been at Beijing University for more than a semester. When he was in school, he went to the library almost every day. This was the first time since he went to college that a girl took the initiative to strike up a conversation with him.

The girl in front of me is tall, has long black and shiny hair, bright eyes and white teeth, and is quite good-looking.

However, Zhao Xiancai had no impression of this girl before, and he was sure that he had never seen her before.

"That's Teacher Liu Shan. You appeared once last time when he was teaching ordinary differential equations in our class, and I haven't seen you since then. Don't you remember?"

Seeing Zhao Xiancai's confused look, the girl quickly explained to prevent Zhao Xiancai from mistakenly thinking that she was here to strike up a conversation.

After hearing what she said, Zhao Xiancai finally understood what she meant by the mysterious man.

"Oh, you said Professor Liu, I went over there to ask him something."

Zhao Xiancai explained that he did not expect that someone would remember him and talk to him in the library just once he went there.

"Senior, what question did you ask Teacher Liu?

Since you have been here, the students in our class feel that Teacher Liu has become a little stricter, and the difficulty of the homework given every week has also increased a lot."

The girl said that she still thought Zhao Xian was the senior.

There was no way she could help it. After class ended at noon last time, she saw Zhao Xiancai running to talk and laugh with Teacher Liu again. At that time, some people in their class speculated that Zhao Xiancai was probably Professor Liu's graduate student.

The only thing that's a bit suspicious is that Zhao Xiancai's age doesn't look like a graduate student, but some people are relatively young, and some in their thirties look only seventeen or eighteen years old.

Therefore, they didn't think anything of this little doubt.

And Zhao Xiancai could tell from what she said that the students in his class seemed to be quite resentful of him.

"It's nothing, it's just that I was writing a paper recently and encountered some problems, so I went to ask Teacher Liu."

Zhao Xiancai explained truthfully.

"So that's it. Then, senior, are you writing your graduation thesis? I don't know if you have a master's degree or a doctorate?"

After looking at the paper on Zhao Xiancai's computer interface, which was almost entirely in English, the girl asked Zhao Xiancai again.

"It's not a graduation thesis.

You said you were a student of Teacher Liu Shan’s ordinary differential equations class last time, so that means you’re a sophomore?”

Zhao Xiancai asked.

"Um."

"If you are a sophomore, then I am not your senior, I am only a freshman now.

If you really want to scream, I should call you Senior Sister."

"How old...how old are you? Freshman? Are you only a freshman?

No wonder he looks so young.

But this is unlikely, right?

You started writing your thesis when you were just a freshman? And it was all in English.

What paper are you writing?"

After hearing Zhao Xiancai say that he was a freshman, the girl suddenly felt embarrassed.

Moreover, she felt a little embarrassed to call a junior student "senior" for a long time, and now she wished she could find a crack in the ground to crawl in.

However, compared to the embarrassment, she was more surprised that Zhao Xiancai started writing a thesis in his freshman year, which even made her unable to speak properly.

"Solubility of singular integro-differential equations in the Riemann-Hilbert problem."

After finishing the title of his paper, Zhao Xiancai saw that the senior student still looked shocked and confused, so he added, "It is to study the convolution operator and Cauchy integral through the Riemann-Hilbert problem.

Singular integro-differential equations of operators..."

"Senior, do you understand?"

Seeing that he had finished explaining and the senior sister still looked confused, Zhao Xiancai asked again.

"I understand, no...I don't understand.

What is that... Junior brother, please continue, I won’t disturb you in writing your paper."

The senior student nodded numbly at first, then shook his head violently, and returned to his seat after finishing speaking, lest Zhao Xiancai had to talk to him about his thesis later.

It would be too embarrassing if I couldn't tell.

"Are today's freshmen so arrogant? Not only do they start writing papers all in English, but they also speak words they don't understand.

No wonder Teacher Liu will make it more difficult for us. Is it because he is so good as a freshman and wants us to get closer to him?

But teacher, there are differences between people."

After the senior student returned to her seat, she began to think wildly in her mind.

Seeing the senior who had just called him senior running back to his seat, Zhao Xiancai ignored her and continued writing his thesis.

When it was past seven o'clock in the evening, Zhao Xiancai finally completed the paper.

But just when Zhao Xiancai packed up his belongings and walked out of the library door, a female voice behind him called out "Wait a minute."

When Zhao Xiancai turned around and looked over, he realized that the classmate who called to wait was the girl from the afternoon.

"Um...junior, can I ask what your name is? My name is Wu Chuyu."

The sophomore sister ran over and asked Zhao Xiancai.

"My name is Zhao Xiancai."

"Are you Zhao Xiancai? No wonder you are so good. You started writing papers in your freshman year."

"Have you heard my name?"

"Yes, I am a cadre of the student union of the college. Although I have never met you before you went to see Teacher Liu, we often heard your name mentioned by the freshmen students in the student union before. Some people said

You have even started studying the contents of your junior year."

…

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