After school in the evening, Zhong Yuxiu walked out of the medical university and saw Yan Rushan leaning on a Hongqi car, with Haonan and Tian Shangguo also next to the car; the license plate number of the car was different from the one that sent her there in the afternoon. Now this car was allocated to Grandpa Yan.

"Brother Yan, why are you waiting outside in such a cold weather?" He walked forward quickly.

Yan Rushan took her hand and let her feel the warmth of his palm. "It's not cold. I was afraid of missing you in the car. You can see me first if I wait for you outside."

Zhong Yuxiu nodded and said, "Let's go home."

"No rush, has your teacher finished get off work yet?"

"I don't know. I haven't seen the teacher after school." He stopped in his tracks when he suddenly remembered that he had said at home that he wanted to come and see the teacher.

Yan Rushan said, "It's a good opportunity to meet your teacher so that you won't be unfamiliar with him when you meet him in the future."

"That's fine." Zhong Yuxiu pulled the person back. A student certificate was required to enter the campus gate. Yan Rushan did not have a student certificate, so he could only register and enter the medical university with Zhong Yuxiu's guarantee.

They went upstairs together and found Principal Xu's office. He was busy and didn't even know someone was coming. Zhong Yuxiu walked up and knocked on the door with a smile.

"Teacher, are you busy?"

Principal Xu suddenly looked up and saw his beloved student. A smile appeared on his face. "You're here. Come in and sit down. Why didn't you go home after school?"

Zhong Yuxiu looked up at the man beside her. Yan Rushan squeezed her hand and nodded slightly to the people in the office.

"Hello, teacher."

Principal Xu squinted his eyes and looked at him. After a moment, he nodded and said, "Come in." Then he stood up, walked out of the desk, and sat down in front of the guest chair.

Yan Rushan and Zhong Yuxiu walked into the office.

"Sit down." Principal Xu raised his hand and pointed casually.

Yan Rushan pulled out two chairs and they sat down. "Hello, teacher. Nice to meet you. My name is Yan Rushan, and I'm Yuxiu's lover."

"I know you." Principal Xu replied nonchalantly.

Yan Rushan was speechless for a moment, then he said, "Teacher, you are Yuxiu's teacher. Before the Republic of China, you were Yuxiu's master, and you were half her father. I had to discuss the marriage with you in advance. I did not do this well, so please forgive me."

Principal Xu raised his eyelids and looked at him straight in the face for the first time.

"I'm not a stingy person. You've already got the certificate, so there's no point for an old man like me to say anything. I just hope you'll treat Yuxiu well. She's a sincere child and will never change her mind once she's made up her mind."

"If one day I find out that you treat her badly and make her sad, I, as your teacher, will not let you go. Don't think I'm just an insignificant Chinese medicine practitioner. If I really want to make a move, your Yan family is not so unbreakable."

Yan Rushan nodded solemnly, "Teacher, please rest assured. I will never treat Yuxiu badly. It is my blessing to marry Yuxiu in this life. She is my lifelong responsibility."

Principal Xu looked at him for a long time, and seeing that he was indeed not telling the truth, he spoke.

"That's good."

"Teacher, why haven't you left work yet?" Zhong Yuxiu interrupted them when she saw them talking.

Principal Xu said, "It'll be a while. I'll be off duty after I finish organizing this last bit of information. Did you bring him here to see me?"

"It was Brother Yan who wanted to come, but I didn't ask him to come."

Principal Xu nodded, and his impression of Yan Rushan improved. The fact that he could think of Yan Rushan, a teacher who had only been teaching Yuxiu for a short time, showed that he really cared about his beloved disciple. He would not believe that he could even consider a teacher who had nothing to do with him.

“That’s thoughtful.”

"It's my duty." Yan Rushan smiled, a very light smile that tinged his temperament with warmth. "Teacher, if there's anything you need help with, Yuxiu and I can help you organize the materials. Can we have dinner together at my house later?"

Principal Xu hesitated for a moment, and Zhong Yuxiu said, "Brother Yan is right. You haven't been to my house yet. Let's have a meal together. When you come to visit in the future, you will be familiar with the place and won't be lost. Don't you agree?"

"That's fine." Principal Xu nodded. Zhong Yuxiu continued with a smile, "Call Professor Ding and Principal Guo, it'll be more lively with more people. I'll have my son Goudan cook some delicious dishes to entertain you three."

Principal Xu had heard of Goudan's name. In Principal Guo's words, he was a robot that was almost the same as a human; except for not being able to speak, he could do everything else.

Principal Xu smiled and said, "It would be even better if they go too. I really should go to your house to get to know you. When you have time, come to my house to get to know me, and come visit often in the future."

Yan Rushan and Zhong Yuxiu readily agreed.

"Teacher, I'll go downstairs for a bit. Yuxiu, you stay with me. I'll come back up later."

"Okay." Zhong Yuxiu nodded, Yan Rushan stood up, nodded slightly and left.

As soon as he left, Zhong Yuxiu helped Principal Xu organize the materials. The materials Principal Xu had to prepare were on traditional Chinese medicine. They read through the organized materials one by one, which involved various conclusions and arguments on cancer.

"Teacher, are you researching cancer?"

"Well, I've always had this idea; I just recently picked it up. However, cancer hasn't been cured yet. We still have no clue, and if things keep going like this, we don't know when we'll find a cure." Principal Xu shook his head and sighed, "For now, we'll just have to put it aside. Conquering cancer won't happen overnight."

Zhong Yuxiu nodded slightly. "Cancer has always been a difficult problem. No one, whether overseas or domestically, has been able to conquer it for so many years. Even if the cancerous area is removed, the patient already has a predisposition to cancer. If the cancer pathogen is not removed, it will sooner or later grow in other places. If the pathogen can be found, the best treatment is to contain it."

"Very true." Principal Xu nodded repeatedly, quite agreeing with her point of view, "What a pity..."

No one has been able to do it until now.

After finishing her research, Zhong Yuxiu didn't interrupt again. She hadn't yet developed her repair fluid. If it succeeded, she could try her hand at studying cancer. There was a drug in the interstellar universe that could detoxify hundreds of viruses in the body. Yes, it was a drug that could detoxify the human body.

Yan Rushan graduated from medical school and recruited Haonan and Tian Shangguo.

"Comrade Yan, do you have something to talk to us about?"

"Yes, it's something. Yuxiu wants to treat Principal Xu, Principal Guo, and Professor Ding to dinner tonight. She can't leave right now, so I can only ask you to go there. Go back and ask Goudan to prepare a few delicious dishes, and you two can go treat Principal Guo and Professor Ding alone." After Yan Rushan finished speaking, Haonan and Tian Shangguo frowned. "Comrade Yan, you know, our mission is to protect Comrade Zhong's life and safety."

If they left, they would not be able to bear the responsibility if anything happened to Comrade Zhong; they would not allow such a situation to happen. The importance of Comrade Zhong must be clear to both of them as they have followed him for many years.

If something really happens to Comrade Zhong, even if they die a thousand times, it will not be enough to make up for the losses caused to the country.