After a moment's thought, Li Yi replied, "Why are you answering the phone? The time I spend with you is so precious. No phone call is more important than the time I spend with you! I'm going back to Shancheng this afternoon, and I only want to be with you every minute and every second. I don't want to be disturbed."

When Li Yi said this, he used acting skills. In Zhang Yifei's opinion, Li Yi's words were sincere from the bottom of his heart.

Sure enough, Li Yi's words immediately put Zhang Yifei, who was initially sensitive, at ease, and she was deeply moved.

Zhang Yifei tilted her head and leaned it on Li Yi's shoulder with a happy expression.

"Brother, thank you. Feifei doesn't want to be separated from you either. How about I quit school and go to the mountain city with you?"

What is that?

Come with me to the mountain city?

Do you see all my female admirers?

That won't do.

Every beautiful woman is just a passerby in my life; don't even think about making me stop for any of them.

Li Yi said, "No, Feifei. Although we can live comfortably without working, I don't want you to give up your degree that you've already studied for three years because of me. Besides, not everyone can get into Tsinghua University. You should cherish this opportunity and graduate smoothly. I'll come to see you from time to time, okay?"

Zhang Yifei had no choice but to say, "Okay."

Li Yi breathed a sigh of relief. He had temporarily gotten past the hurdle of dealing with Zhou Mei and Zhang Yifei. He would find another opportunity to reply to Zhou Mei.

Suddenly, Zhang Yifei asked, "Brother, you said you'd explain that difficult problem to them this morning? You haven't prepared anything since last night... how are you going to explain it to them?"

Li Yi: "That makes sense. Let me see, I'll prepare right away."

Li Yi opened the difficult problem that Professor Hua Wenyu had sent him, and from the car, it seemed that Zhang Yifei was not bothering him.

A minute later, Li Yi said, "It's simple. Everything is ready. I'll explain it to them when we get there."

Zhang Yifei: "Huh? You learned it so quickly?"

Li Yi said, "Not fast, right? It took me a whole minute to think!"

Zhang Yifei: "......."

Zhang Yifei was speechless. Before meeting Li Yi, she was confident that she was a top student.

But after meeting Li Yi, Zhang Yifei felt like she was a terrible student.

Li Yi learns things incredibly fast; he can instantly understand mathematical problems that have puzzled top mathematicians in China for years.

It's true what they say, comparisons are the thief of joy!

Li Yi called Professor Hua Wenyu again.

Professor Hua Wenyu answered the phone immediately when he saw that it was Li Yi calling, and said, "Professor Li, why are you calling me so early? Is there some progress on that difficult problem?"

Li Yi: "Hmm, I just took a look, it's not difficult. I'll come to the academy to find you in a bit and help you write out this problem."

"What? You can write it in a short while?" Professor Hua Wenyu asked in astonishment.

"Yes. I'll be there in about ten minutes," Li Yi replied.

"So soon? I'm still at home. I'll come over now, maybe a little later than you." Professor Hua Wenyu was very pleased.

Professor Li Yi truly deserves his reputation as a mathematical genius. Is the fluid mechanics problem that has plagued his team for five years about to be solved?

A dozen minutes later, Li Yi brought Zhang Yifei to Tsinghua University.

The two of them got out of the car, but were stopped at the door.

Because the security guard checked identification, Li Yi did not have an access card or entry/exit permit.

Yesterday, Zhang Yifei borrowed a classmate's access card to get him in. Today, Li Yi thought that as a professor at the school, he should be able to go in, but he was turned away.

Li Yi looked at the two security guards and explained, "Security guards, I really am a professor and doctoral supervisor at Tsinghua University. I have urgent business, please let me in."

Zhang Yifei nodded repeatedly and said, "Yes, I can testify that he is a professor at Tsinghua University. Even President Xu Ben'an knows him."

However, the security guard looked Li Yi up and down and realized that he was too young to be a doctoral supervisor; he was more like a college student.

"You, a professor? A doctoral supervisor? If you're a professor, then I'm an academician of the Chinese Academy of Sciences!"

Another security guard said, "Alright, you don't even have identification, so don't cause trouble here. Get out of here!"

Li Yi: "......"

Li Yi was speechless. "Did I just mess things up?"

You don't look like a doctoral supervisor, do you?

Li Yi asked, "If I really were a professor or doctoral supervisor at Tsinghua University, what would I say?"

The rather burly security guard said, "If you really are a professor or doctoral supervisor at Tsinghua University, I'll eat shit while I'm upside down!"

Li Yi: "Good! Very good! You'll be eating shit upside down now!"

"Pshaw! Do you think I'm easily scared?"

"Heh, still dare to brag? Get out of here and cool off, don't block the door."

The two security guards started to shoo people away.

Zhang Yifei was a little anxious and tried to explain to them, but to no avail.

Li Yi took Zhang Yifei's hand, stepped aside slightly, and said, "Feifei, don't waste your breath arguing with them. Wait for me, I'll make a phone call."

Li Yi picked up his phone and dialed Principal Xu's number directly.

"Professor Li, why are you calling me so early in the morning? Is there any progress on the matter that Professor Hua asked you to handle last night?"

Li Yi: "Yes, I've solved that problem. I'll come back in a bit to write down the answers. But right now, I can't get in. Your security guard stopped me, saying I don't have an access card or work ID."

"Oh? Professor Li, I'm so sorry, I was only specially appointed yesterday, and the work permit hasn't been made yet. It's all my fault." Principal Xu said, "Wait a few minutes, I'll come to the school gate to meet you!"

Li Yi: "How embarrassing!"

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