A brief idea:

First, the second puzzle, literally, Lan Silin wants him to find someone - that is, there must be an answer to the puzzle in that person, or the existence of the third letter.

Secondly, we must consider the issue of information symmetry. Lan Silin asked herself to find a betrayer, but the betrayer himself should not know that he was targeted - he should have just been entrusted by Lan Silin to save a letter left to him.

For such a reserved puzzle, since Lan Silin himself has left Kanglong Academy, he will never be able to make any adjustments to emergencies. He cannot know the process of Li Weiyin solving puzzles, so Li Weiyin can forcefully solve puzzles in a way that does not conform to the rules of the game.

——No need to find a "betrayer", just determine the scope.

Then, ask one by one.

Don't worry about alarming the snake, because no one knows what they are doing except himself and Lan Silin.

Although such methods are not very glamorous, for Li Weiyin, as long as the result is correct, there is no such thing as the process.

After thinking through the middle joints, it is time to practice.

During the lunch break, Fan Lei made a meal as usual and was about to walk to the table on the other end of Fang Chang. When he turned around, he met Li Weiyin holding a lunch box.

Li Weiyin had a expressionless face and asked:

"Do you have Lan Silin's letter?"

He subconsciously opened his mouth and showed a look of surprise.

"It turned out to be you?"

Li Weiyin frowned. Before he could speak, Fan Lei looked around nervously, noticed that the instructor did not look here, and whispered:

"Come with me."

The two put down their lunch boxes and walked to the canteen door as if nothing had happened, without attracting anyone's attention.

After going downstairs, Fan Lei ran straight to the playground. Li Weiyin followed behind. The two of them returned to the playground. A student was playing football on the playground. Fan Lei breathed a sigh of relief, slowed down, and walked towards the other end of the sand pool.

"Lan Silin only told me that after he left school for about a week, someone would come to ask me for a letter. I didn't expect that the person was you, nor did I expect that it would be so soon."

Li Weiyin didn't speak, and had his own considerations in his heart - Lan Silin was not omniscient and omnipotent. He reserved a week for himself to solve the first two puzzles, but he did not expect that he had already reached this point just the day after receiving the puzzle.

That person underestimated himself.

Thinking of this, Li Weiyin felt a little calmer and asked again:

"Do you know what he wants to do?"

"No one in Kanglong knows what Lan Silin wants to do." Fan Lei smiled bitterly and shook his head:

"He's just a total madman."

"It was about a month ago. When I had dinner and was about to take a shower, he stopped me downstairs and asked me to accompany him for a while. On the way to the playground, he told me all my life experiences, including some private matters that I never told anyone..."

Li Weiyin was stunned. A strange thought suddenly arose in his heart.

How many letters did Lan Silin leave? In fact, she was just a gear in his serial layout?

"He used this to threaten you?"

"In such a place where you can't see the light of day, even if you know there is a mole under my **, it can't threaten me." Fan Lei smiled self-deprecatingly:

"In order to let me take care of this letter, when the next person comes to collect it, he gave me a condition...a condition that was so generous that I could not refuse."

“What conditions?”

"He promised to arrange for my family to pick me up within a month after he went out."

Li Weiyin narrowed his eyes: "You just trust him so much?"

"I have no reason not to try." Fan Lei was obviously a relatively open-minded person, and he shrugged:

"What I want to do is to keep a letter and hand him over to the next person. There is no risk or effort in this kind of thing. Besides, since he has the ability to go out and knows that I have so many private matters, it is probably not difficult to contact my family. I should always try it."

Li Weiyin agreed to this statement in his heart. Fan Lei is indeed a very smart person.

He continued to think: Unfortunately, Fan Lei also ignored a key link - the issue of information asymmetry. He didn't even know until now that he was the so-called "betrayer" in Lan Silin's eyes.

The second puzzle is easily solved, and it is also attributed to Li Weiyin's idea of ​​reversing thinking and exploiting loopholes.

But after skipping the entire exploration process, there will inevitably be some side effects. He still doesn't know why Fan Lei was a "betrayer".

Even in the entire arson escape incident, Li Weiyin speculated that the least suspected was Fan Lei. The first incident he found Fan Lei to ask was just a mentality that there would be no problem when he tried it. He did not expect that he would hit the dead mouse directly and hit him by chance.

So, Li Weiyin tried to draw some useful information from Fan Lei.

"Did he tell you something that night?"

"What else can I say? I smiled at me all night, and when I think of his schizophrenia, I was so scared." Fan Lei sighed and suddenly remembered:

"Oh...yes. He also asked me some things about Stone Town."

"Shitou Town..." Li Weiyin frowned.

"arrive."

While talking, the two of them had already arrived at the sand pool.

Fan Lei rushed back to have a meal, but he didn't want to have too much connection with Lan Silin's matters, so he stopped talking and walked straight to the southeast corner of the sand pool, closed his eyes, recalled carefully for a while, and muttered:

"Three left, four first."

According to his usual stride, he took three steps to the left, and four steps forward, stepped on the sand below, and pointed with his hand:

"That's it."

Li Weiyin asked:

"Did he calculate the position according to your stride?"

"Yes." Fan Lei sighed: "The letter was wrapped in plastic paper and folded into a small piece. I looked at him buried it. At the bottom of the sand pool, you have to work hard."

Li Weiyin nodded, Fan Lei was silent for a few seconds, and then said:

"Li Weiyin. It's okay if you listen to my words. The one named Lan Silin is not a simple character. If he really wants to plot against others, he will count them to death. Although I don't know what he wants you to do, you must be careful."

Li Weiyin didn't take this sentence to heart. He had already confirmed that Lan Silin was not a god and monster, and human calculations were ultimately limiting. Seeing that Li Weiyin did not respond, Fan Lei sighed, ignored him, and rushed straight to the cafeteria.

Occasionally, the noise of students from afar came from a distance, and he turned his eyes to the sand pool, and the scene of the man writing and drawing on the sand pool with a wooden stick appeared in his mind.

When he wrote down those passwords on the sand, what was his calculations?

It will be known soon. He is getting closer and closer to the truth.

Thinking of this, a warm feeling appeared on Li Weiyin's chest again. He suppressed the fanaticism deep in his heart, squatted down as calmly as possible, and used his hands to dig up the sand in front of him.

More than ten minutes later, the sand pool was bottomed out. Li Weiyin's fingertips, covered with gravel, touched an object. He picked it up carefully, and his heartbeat became faster and faster.

He put the object in his pocket, walked out of the playground with a calm expression, walked into the nearby toilet, entered the compartment, locked the door, sat on the toilet lid, and took out the letter.

He let out a light breath and removed the plastic seal bag on it.

This time the letter is more formal—at least in envelopes.

He took out the envelope and read the first line of words on it through the dim light in the toilet, and his face turned pale in an instant.
Chapter completed!