Starting as a Wallfacer, his defection to the Three-Body Problem shocked the world.

This wasn't the first time Lin Xuan had met Zhao Kaiming. He had been present at several of the PDC meetings regarding the manufacturing of spaceplanes.

A spaceplane is a relatively new invention.

It can take off from the runway like a regular airplane, ascend to the top of the atmosphere in conventional aviation, and then start its rocket engine to begin spaceflight and enter space orbit.

The concept of this technology was actually proposed in the last century, but previously, the resources invested in aerospace engineering were not as much as imagined, so this technology was shelved.

"Mr. Lin Xuan, are you here today because you need any technical support from us?"

Zhao Kaiming revealed a kind smile. He had a good impression of this Wallfacer from China. The giant database he created had solved many problems for the computing and storage work of aerospace engineering.

Furthermore, over the past year, Lin Xuan's advancements in controlled nuclear fusion technology and space elevator technology have yielded the greatest overall technological benefits to humanity compared to the other Wallfacers.

"It's nothing, I just came to find someone's information."

Zhao Kaiming nodded slightly.

"Is that Cheng Xin?"

This time, it was Lin Xuan's turn to be shocked.

"how do you know?"

"Originally, the Shanghai Aerospace Research Institute would never keep the information of an ordinary PhD in its database. After all, there are countless PhDs graduating from here every year. Even if Dr. Cheng Xin became a technical assistant at PIA after graduation, her qualifications would still not be enough to leave her file information at the Eighth Aerospace Research Institute."

"But a year ago, a guy named Shi Qiang specifically asked the PDC to retrieve a file on Cheng Xin, saying that the fifth Wallfacer, Lin Xuan, might need it in the future. So we spent more than half a year reorganizing some of the files on Cheng Xin that had not yet been deleted and storing them in the archives."

Lin Xuan recalled carefully that a year ago, when she had just become a Wallfacer, she did meet Cheng Xin in front of Shi Qiang and installed the tracking device on Cheng Xin.

Shi Qiang probably noticed Cheng Xin at the time. Although Lin Xuan didn't say anything, he still had the PDC keep a copy of Cheng Xin's doctoral studies materials.

"As expected of the number one assistant in the Three-Body world, Shi Qiang is really amazing. He was able to arrange his work so early on. Such insight is something that others might not be able to do."

Soon, the two of them, led by Zhao Kaiming, headed to the archives.

At this moment, Yun Tianming behind him was too shocked to speak.

No wonder he said that this person looked so familiar. When he first met him, Yun Tianming felt as if he had seen him somewhere before, but it was definitely not in reality.

Now, he finally understands.

Lin Xuan, the Fifth Wallfacer.

Yun Tianming didn't have many friends. After his father's divorce, only he and his sister were left at home. So during his time in the hospital, he passed the time by watching the news.

Yun Tianming was naturally aware of the Wallfacer Project from a year ago. At the time, he wondered why two of the five Wallfacers were Chinese.

Lin Xuan was one of the two Chinese Wallfacers.

Shock level from Yun Tianming +15.

Actually, there was another reason why Yun Tianming couldn't recognize Lin Xuan. Just as Cheng Xin couldn't guess who gave her that star, Yun Tianming never thought that one day a Wallfacer would personally pick him up at the airport.

Since the start of Project Wallfacer, the PDC has been intentionally or unintentionally portraying Wallfacers as invincible in various films and television shows. As a result, the masses have always firmly believed in the Wallfacers' power. Just look at Tyler; even though he now spends all his time fishing in Eden, the masses still regard him as a god and consider everything he does as part of the project.

This reasonably explains why Yun Tianming hadn't recognized Lin Xuan. He couldn't even imagine that the person next to him was a Wallfacer.

But this made Yun Tianming feel much more at ease.

Cheng Xin is able to make a Wallfacer as a friend, so I'm sure she's doing very well now.

Cheng Xin's seven years of graduate studies were quite uneventful.

According to the records, Cheng Xin stayed at Beihang University after graduating with her bachelor's degree to pursue a master's degree in aerospace-related research.

After three years of master's studies, Cheng Xin ended her master's program with a staggering number of publications: 5 SCI (Science Citation Index) papers and 15 CSCD (China National Core Journals).

But at the same time, this also drained her last bit of enthusiasm for aerospace work.

After pursuing her doctorate at the Eighth Research Institute of Aerospace Science and Technology, Cheng Xin no longer focused on traditional aerospace research but instead broadened her professional field. During this period, she became fascinated with nuclear energy research.

This is one of the reasons why Zhao Kaiming had a deep impression of this girl.

"My assessment of her at the time was that it was a pity. If she had devoted all her energy to the research of aerospace engines during her five years of doctoral studies, she would now be the youngest Yangtze River Scholar in the entire Chinese aerospace field."

There are different levels of researchers. Doctors are generally at the bottom. Above them are the Young Thousand Talents Program, the Thousand Talents Program, and the Yangtze River Scholar Program. Even Zhao Kaiming, who has become an academician, did not have the same talent as Cheng Xin at her age.

"But everything changed after the Trisolarans appeared. I'm so glad that Cheng Xin didn't listen to me back then. When she graduated with her doctorate, she only submitted the minimum number of papers required for graduation. But after she joined PIA a year ago, we learned that she had spent almost five years focusing her energy on nuclear energy research."

"Chemical rockets are like the chimneys of the Industrial Revolution. Poets praised them, believing they represented industrial civilization. They still praise chemical rockets now, believing they represent the space age, but in reality, these rockets are unlikely to even live to see the space age."

These are Cheng Xin's original words, and also her motto for dedicating herself to researching new types of rocket engines.

"By the way, you should have heard about the spaceplane that has been developed recently. Cheng Xin was one of the early designers of the spaceplane. Later, she was transferred to PIA, and the project was handed over to other people."

After leaving the Eighth Aeronautical Research Institute, a sentence from Zhao Kaiming kept replaying in Yun Tianming's mind.

"Cheng Xin is a good girl. In terms of scientific research ability, she is definitely top-notch. However, she is extremely dull when it comes to handling emotions. She is kind to everyone and has a compassionate heart for everything. If this personality were in peacetime, there would be no problem. But in the context of the Trisolaran invasion, Cheng Xin's future path will be quite difficult."

Yun Tianming pondered Zhao Kaiming's words carefully, and suddenly, a fire ignited in his heart.

This flame echoes the sun in his heart.

He knew what he had to do; he couldn't just die like that, dying so meaninglessly.

Lin Xuan was unaware that he originally wanted Yun Tianming to give up his love for Cheng Xin and completely give up on the idea.

However, due to Zhao Kaiming's final remark, the outcome of the matter took a completely different turn.

"Are you satisfied?"

Lin Xuan switched the car to autopilot and poured herself a cup of hot tea.

"This is everything Cheng Xin went through after you broke up. At this point, she is from a completely different world than you."

Lin Xuan gestured with her hand.

"The gap between you is even greater than the distance between the Trisolaran fleet and Earth."

"Thank you."

Yun Tianming thanked Lin Xuan.

He knew that if it weren't for the help of this wall-faced man, he might have been stopped by the security guard at the entrance as soon as he entered the Eighth Aerospace Research Institute.

Although he didn't meet Cheng Xin in person, he was already content. He felt that he could do something so meaningful as his life was about to end, which was a way of giving an account of the first half of his life.

Don't be too discouraged.

Lin Xuan handed a cup of hot tea to Yun Tianming.

"I told you, I would introduce you to her."

"When?"

Yun Tianming was no longer very interested in seeing Cheng Xin. Just as Lin Xuan had said, she and Cheng Xin were now from two different worlds, both physically and mentally.

He has at most a year left to live with his lung cancer. After that, he will be cremated like an ordinary person, his body turning into a pile of dust.

"I don't know, maybe six months, maybe a year, but believe me, you will see her, and she will come to you on her own initiative."

As Lin Xuan said this, the corners of his mouth turned up slightly, revealing a smile exactly like Thomas Wade's.

Only he himself knew what a cruel plan was hidden behind that smile.

"Give him more hope before giving him final despair."

This was a consensus reached between Lin Xuan and Thomas Weld during their phone call.

As Lin Xuan drove her Maybach, she suddenly remembered another story.

Rainy night, elevated road, Maybach speeding by, the protagonist of that story, just like Yun Tianming, is a complete loser, and I am like the devil beside him, knowing what will happen next, but having to watch him step by step walk into the abyss.

"Would you trade a quarter of your life?"

Lin Xuan really wanted to ask Yun Tianming this question, but in the end he held back.

Finally, the two boarded a plane at Hongqiao Airport bound for the Third Red Coast Base.

For Lin Xuan, a Wallfacer, transferring a patient would be an easy task.

He requested permission from the PDC to take Yun Tianming away, citing his need for Yun Tianming's assistance with his plans.

PDC quickly granted approval and sent a notification letter to Yun Tianming's family, namely his father and his sister who had always wanted Yun Tianming dead.

PDC originally wanted to issue Yun Tianming a death certificate directly, as that would be the easiest way, but Lin Xuan rejected this plan. He emphasized that Yun Tianming must be kept alive and that his information about late-stage lung cancer should be recorded in the database.