This is probably a very difficult moment, and everyone would think, "If only it had never happened."

But everyone is included in this, except Lao Lin.

"Oh, that's unfortunate." said Lao Lin.

Hearing such a casual remark, even Director Ma, who is used to seeing patients, was a little surprised: "It's not easy for you to think like this."

"The world is so big, anything can happen to anyone, it's no big deal."

This was the second time Lin Chaoxi heard Old Lin say this in this clinic.

"That's great, that's great." Lao Lin was still smiling, showing only his interest in scientific research. "So what is the relationship between brain damage and Alzheimer's?"

"Let me give you a brief introduction." Director Ma folded his hands and looked at Lao Lin seriously. "Because the latest foreign research has found that a concussion may lead to increased levels of bace1 enzyme and beta-amyloid protein in the brain. Of the two, the former plays an important role in the synthesis of the latter, and the latter is an important component of senile plaques, a pathological product of Alzheimer's disease. This is also my personal research direction."

"Oh, so that's it. Medicine is also very interesting." Lao Lin said happily, "That's great. I am willing to cooperate with the research."

"Thank you very much. I really want to follow up on your long-term case." Director Ma shook his head, "But I didn't come to you today just for this."

Lin Chaoxi frowned to show that he didn't understand.

Director Ma said, "I just introduced the cause of Alzheimer's disease to you because the pharmaceutical research institute I have been working with for a long time has recently developed a new drug that is an inhibitor of BACE1 and is recruiting subjects for a phase I clinical trial. They hope to find a few Alzheimer's patients who have been confirmed to have suffered traumatic brain injury to participate in the drug trial of the new drug. I wonder if you are willing to participate."

Lin Chaoxi suddenly raised his head and looked at Director Ma, speechless.

"Why not?" Old Lin said without hesitation, "This is a good thing."

"The efficacy of the treatment is still unclear, and we are actually treating you as a guinea pig," Director Ma said frankly.

"I'm not a guinea pig, I'm dedicating myself to science," Lao Lin said with a smile.

"Thank you so much." Director Ma stood up and shook hands with Lao Lin. "If you are willing, my students will take you to fill out some personal information. If you pass the screening, you will be notified to participate in the trial."

"No problem."

Lao Lin is still cheerful.

Whether it was learning that his Alzheimer's disease might be related to a car accident or the opportunity to find a new drug to treat it, he remained calm and treated it all as if it were no big deal.

Lu Zhihao led the way in his wheelchair, while Lin Chaoxi and Lao Lin followed behind.

The hospital corridor is long and the walls are white and bright.

Similar scenes, similar departments, the memories that she thought she had forgotten resurfaced very slowly and lightly.

It was a winter, a little before the division into liberal arts and science classes in high school.

When she went out in the morning, she and Lao Lin parted ways. Lao Lin was still alive and kicking, but when school was over, the head teacher brought the police to find him, saying that her father suddenly fainted on the road.

When she rushed to the hospital, Lao Lin already had many tubes inserted into his body.

The doctor said that Lin had suffered a head injury and, judging by the bruises on his body, was probably involved in a minor car accident. The patient seemed fine at the time and walked away, but hours later his condition worsened and he fell into a coma, which is not uncommon.

After Lao Lin fell into a coma, the traffic police could not take a statement, so they could not find the location and time of the accident, let alone the perpetrator. There was also the possibility that Lao Lin himself was injured, so they had to bear the medical expenses themselves.

So for her, her father's coma is not only a mental burden, but also a heavy financial pressure.

During that time, the family had no source of income, neighbors borrowed money, and medical insurance also covered a large part of the expenses, but every month when the hospital asked for payment, she was very troubled. Now I don’t remember how I got through that period, anyway, it was a very ordinary experience.

Relatives, schools, customers, bosses, teachers, classmates... During adolescence, people always feel that the whole world is against them, so they rebel against everything.

But during her adolescence, she lost the ability to resist.

After a long period of treatment, and painful and hopeless waiting and praying every day, when Lao Lin woke up and saw her pale and thin appearance, the first thing he asked was: How did you lose weight successfully?

She originally wanted to hug Lao Lin and cry, acting out the father-daughter love scene that she had imagined many times in her mind, but when she looked at Lao Lin's smiling eyes, all her sad emotions disappeared in an instant.

And the most important thing was that Lao Lin then told her that his father really had money, that his father had several apartments, and that his father had several passbooks hidden in his shoes, but she had no idea about this and she worked hard every day without knowing what he was doing.

Not only did Lao Lin not comfort her, he stroked her head and said, "You're doing fine. Your double eyelids and dimples have all gotten thinner..."

But this is probably the charm of Lao Lin’s personality.

Makes you feel that life is just a journey full of new experiences.

Good things, bad things, and many things in between are mixed together and become our daily routine.

Anything can happen, so it's no big deal.

Looking at my father's still casual and peaceful face.

She never thought that what she thought was in the past had actually been affecting them and was still affecting them today.

Lu Zhihao took them to the quietest place in the rest area and began to register Lao Lin's detailed information, which was more detailed than before.

After that, he started giving Lao Lin some simple tests that she didn't understand either.

His friend who always seemed carefree when he was young was now asking his father some serious questions.

He was very focused and meticulous. Even though he broke his leg yesterday, he came today in a wheelchair. It must be difficult for Director Ma to meet a student with such personality.

Lin Chaoxi looked at the blue logo of the Medical College Affiliated to Yongchuan University on his chest, and finally knew where Lu Zhihao went after giving up Sanwei University.

"So many questions?" Lu Zhihao took out another stack of papers. Old Lin glanced at them and said with disdain, "I am an senile dementia patient and you are giving me an IQ test. Isn't that a mockery?"

"Uncle, this test can check the extent of your cognitive impairment. Although it will take a little time, but..."

"knew."

Lao Lin interrupted him. He was always nice to serious children.

Lin Chaoxi watched them talking in low voices, put his schoolbag on the chair, and went to buy them some water.

On her way back, she passed by the wall-mounted TV outside the lounge area, and Hanamaki's bright smiling face flashed across the screen.

There were many aunties and grandmothers sitting on the plastic chairs in the rest area. When they saw the smiling face of little brother Hanajuan Oh, Not the National Ki Jiang, all the aunties' faces were filled with love.

Lin Chaoxi also sat down casually. The TV volume was turned neither too high nor too low. She squeezed out some water and took a sip.

It was a national image advertisement, shot in conjunction with the upcoming international education conference, and was being played on screens of all sizes across the country.

In the promotional video, Huajuan is a child from an ordinary family, no different from millions of ordinary children across the country. He wore a red scarf to go to primary school, was admitted to a key junior high school, studied hard, and went to a key high school. However, when filling out his application form before the college entrance examination, he felt at a loss.

His mother wanted him to study finance because it was said that he could make a lot of money in finance; his father hoped that he could become a doctor so that the family would not have to worry about getting sick when they got old; his teacher thought that his grades were good enough for him to be admitted to a top computer science major at a prestigious university.

Everyone's opinions were combined, leaving an eighteen-year-old child with no choice.

On weekends, his parents drove him back to his hometown so that he could fill out his application easily.

His hometown is on the seaside, with beaches, reefs and the blue sea.

His grandfather took him out to sea to fish in a boat. Thousands of boats were competing with each other, which reminded him of some scenes from his childhood. That was probably the most carefree time of his life.

His grandfather taught him to recognize the fish in the ocean and the shells on the beach. They also ate freshly caught shrimps on the boat. He was interested in the diversity of creatures from a young age.

Naturally, at the end of the ad, he changes his major to marine biology, a subject that his parents think has little future.

The ad was played again from beginning to end, and Lin Chaoxi watched it again from beginning to end.

Lu Zhihao pushed the wheelchair to his side, and Lin Chaoxi handed him the water. Little Lu opened the bottle of mineral water without hesitation and took a big sip.

"My uncle sent me away, saying he wanted to do the questions alone," said Lu Zhihao.

"Of course, he's afraid that his IQ is too high to scare you, so maybe he's faking it." Lin Zhaoxi said with a smile.

"Ah?" Lu Zhihao didn't quite understand. He took another sip of water and said, "My uncle also asked me how I knew Pei Zhi."

Lin Zhaoxi was stunned for a moment, then smiled helplessly: "Why did he suddenly ask this?"

"I don't know either……"

"Then how did you two know each other?" She turned and looked at Comrade Lao Lu.

"We attended an elementary school math Olympiad summer camp together, and it was extremely brutal."

"Really?"

"Yes, everyone was having a hard time studying every day. But Pei Zhi was different. He was a true genius and always got full marks on any question. Many people left during the summer camp. When a leader came to inspect, he finished the entire test paper in a very short time in front of the leader and then withdrew directly. From that day on, I vowed to be friends with him for life."

Lu Zhihao spoke calmly.

Lin Chaoxi lowered her head slightly, and the bright light from the screen fell on her. She was not surprised by this story. This was the official version that she had not experienced, and it should be so.

After a while, she said, "He has always been really good."

"How did you two know each other before?" Lu Zhihao asked tentatively.

"He and I have been classmates since childhood." Lin Zhaoxi smiled, "We were in the same school but different classes. I know him, but he doesn't know someone like me."

"Is that so..."

Lu Zhihao drawled out his words, thought for a moment, took out something and placed it in front of her.

Lin Chaoxi looked down and found the familiar envelope. It was bulging with red words on a white background, and there were at least several sheets of manuscript paper stuffed inside. Old Lin must have secretly put the answer in the case bag and brought it out.

"Uncle said, let me give this to you."

Lu Zhihao's eyes were firm. Although he probably didn't know what had happened, he hoped that she could take it over.

Lin Chaoxi held the envelope, and this time, she did not hesitate at all.

She leaned down, took the ballpoint pen from Lu Zhihao's chest while he was in shock, and immediately stood up and walked out of the lounge.

The last song in the commercial was heard, very softly, and I didn't know who was singing the song about dreams and the future.

The wind was very light, blowing past her ears. The seats on both sides moved back. She walked quickly, opening the chat history with Pei Zhi as she walked. Looking at the long list of medical instructions, she replied with three words - thank you.

She put away her phone, pressed the ballpoint pen, the pen tip popped out, and the door was right in front of her.

She held the envelope and wrote a line of formula on it the moment she pushed the door open.

e=mc2 (squared)