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Lin Dong came to Shanghai in a private capacity, and no one was notified before he came, except for Xiao Tang, the secretary who accompanied him.

When Xiao Tang found the previous letter from the general office and rushed back to the office, Lin Dong took out another piece of hand-drawn paper with slightly trembling hands, and when he saw the same drawing, Lin Dong's face flushed, and he tried to restrain his over-excitement.

Let Xiao Tang go out first, looking at these drawings silently alone, Lin Dong's thoughts seemed to drift into the distance, and even secretly shed tears. Although this drawing is very ordinary, and the design in it is too backward for now, Lin Dong will never forget it in his life, because the content of this drawing is the design he made when he participated in the Galaxy Giant Machine General Integrated Circuit Project.

And there is another important reason why this design drawing makes him remember it vividly, because he still clearly remembers that it was the electronic circuit defect of this design that led to a constant argument with Su Yichen at the beginning, and the two of them held their own opinions on this, almost not giving an inch, and quarreled so much that they were red and red-faced until the final decision was made by Professor Wan Changchun and repeated the calculation before the results were obtained.

Time has passed, although more than 30 years have passed, but the scene of that year is still vivid, and now, the same drawings actually appeared in front of his eyes, how can this not make Lin Dong excited? And behind the excitement, there were incredible doubts, because there were very few people who experienced this back then, and there were only Professor Luo Shaohua, Professor Wan Changchun, Lu Yuanming, Yunmei, Luo Yan and Su Yichen, who was arguing with him.

Among these six people, Professor Luo Shaohua, Lu Yuanming, and Yun Mei have long passed away from each other, Luo Yan's whereabouts have been unknown since she left Shimen Institute of Technology, and Professor Wan Changchun and Su Yichen mysteriously disappeared on the halfway road to support the Northwest 781 Base, and their life and death are still a mystery. So, who sent this letter? Could it be Luo Yan, who has not been heard from for a long time? Or is it ......?

For the latter possibility, Lin Dong thought that it was very small, but he didn't know why he suddenly had such an idea. I couldn't wait to pick up the envelope and look at it carefully, the envelope did not leave the sender's name, but there was an address to send the letter, the address was written as a private bilingual middle school in Shanghai, and the dormitory number, looking at the address on the envelope for a long time, Lin Dong quickly made a decision, he wanted to go to Shanghai to meet the sender immediately, no matter who this person would be, he must see him immediately.

asked Xiao Tang to book a plane ticket for himself immediately, and at the same time told him that no one should be informed of this matter, and in this way, Lin Dong took the earliest flight to Shanghai. After arriving in Shanghai, he took the envelope and took a car and went straight to Yuying International Middle School, standing at the door of this middle school, Lin Dong's mood calmed down, and after thinking about it, he asked Xiao Tang to wait at the door, walked into the school alone, and asked someone to find out the location of the dormitory, Lin Dong knocked on Su Yichen's door.

The door opened, and the light in the corridor was a little dim, but Lin Dong saw clearly who the person who appeared from inside the door was for the first time, when Su Yichen, who was extremely familiar to him, and his face was almost unchanged from more than 30 years ago, standing in the door and smiling at him, Lin Dong was stunned at first, and then raised his hand and rubbed his eyes incredulously, because he couldn't believe his eyes.

"Brother Lin......." Looking at Lin Dong, who was already old, Su Yichen opened his mouth and snorted softly.

"I'm dreaming, right?" Lin Dong muttered to himself, before knocking on the door, Lin Dong thought that the person who appeared behind the door was most likely Luo Yan, but who would have thought that it would be Su Yichen. Although Lin Dong had also thought of this answer, he never imagined that Su Yichen, who was standing in front of him, was so young, as if he had not changed at all from the one in his memory. How is this possible? More than 30 years have passed, and Su Yichen is an old man of nearly 60 even if he is alive, how can he still be the same as before?

"I must be dreaming......." Lin Dong said to himself, but when Su Yichen called him lightly like back then, Lin Dong's whole person was suddenly shocked, and his gaze at Su Yichen suddenly became particularly sharp, he looked at Su Yichen angrily, and shouted with vigilance and defense: "Are you a human or a ghost?" Why is it the appearance of Xiao Su? ”

"It's me, Brother Lin, I'm who I am, of course I'm a human being and not a ghost." Facing the old friend who may be the only living in the world, Su Yichen knew that it was difficult for the other party to accept his current appearance for a while, after all, more than 30 years have passed, and anyone who has not changed his appearance will be surprised when he sees it, let alone Lin Dong, who is not the slightest psychological preparation?

Taking a step forward, Su Yichen held Lin Dong's slightly trembling hands, he told Lin Dong that those drawings were sent by himself, and also told the story of their argument over this design back then, with Su Yichen's words, and at the same time feeling the warmth from his hands holding his hands, Lin Dong began to believe that the young man in front of him was Xiao Su back then.

"But how could you ......?"

"Professor Wan and I encountered some accidents on the way to Base 781, these words are too long, if you want to know, I will talk to you slowly."

Su Yichen mentioned the names of the 781 base and Wan Changchun, and Lin Dong already believed in the identity of the other party in his heart. At this moment, he couldn't help but burst into tears, and grabbed Su Yichen's shoulder hard to blame him for why he appeared.

"Brother Lin, this is not a place to talk, let's find a place to sit." Looking at Lin Dong, who was too excited, Su Yichen said softly. Lin Dong nodded in agreement, Su Yichen asked him to wait, returned to the house and said hello to Kevin who was taking a bath, and then found the dormitory key that Tang Wei had left for him before, since Tang Wei left, his dormitory has been empty and unoccupied.

took Lin Dong to open the door of Tang Wei's dormitory, and the two walked in one after the other. The personal belongings in the room have long been cleaned up, but simple furniture such as beds and tables and chairs are still there. Giving the chair to Lin Dong, Su Yichen sat directly on the edge of the bed, at this time, the sunset outside the window slanted into the house through the gap in the curtains, which happened to shine on Su Yichen's face, Lin Dong looked up at Su Yichen's appearance, as if he had returned to the time of the year for a while.

"You are really Xiao Su, you are really Su Yichen!" At this time, Lin Dong did not hesitate any longer, he was sure that the young man sitting in front of him was Su Yichen back then, but he had obviously been missing for more than 30 years, why was he still so young?

"Back then, Professor Wan and I went to the 781 base as the first batch of personnel to report, and you know about it." After Su Yichen sat down, he said, he was very aware of the doubts in Lin Dong's heart at this time, not to mention that even if Lin Dong didn't ask him, he would tell him what happened back then. With Su Yichen's story, from that year he and Professor Wan Changchun came to Yingtai in the military train, and then met Hu Zhijun and Gu Damai who came to pick them up in Yingtai, and slowly talked about how they drove across the grassland to the 781 base due to road reasons, but they were chased by wolves on the way. Then, when he escaped by mistake, he strayed into the desert, until he later discovered a strange building in the desert, Gudamai was swallowed by quicksand, and he, Professor Wan Changchun, and Hu Zhijun were trapped in the depths of the base .......

This talk is a long time, Lin Dong did not interject anything in Su Yichen's narration, he has been listening quietly, but the surprise and shock in his expression cannot be concealed, Lin Dong could not imagine that there is such a place in the vast desert in the northwest, and it also involves an extremely developed advanced civilization in the universe - the existence of the Rand civilization, and even in that mysterious base, there is a huge secret of the origin of human beings.

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