(Thanks to "SP55AA" for the reward)

When a group of people left the general affairs building, the night had already covered the whole campus, and the white ball street lamps were mixed with the shadowy shade to guide the way, and if you looked up slightly, you could see the faint canopy above the treetops and a crescent moon, and a bright and transparent star dotted not far from the crescent.

Teacher Shen invited Director Wu to dinner very sincerely, but Director Wu refused, joking that the yellow-faced woman was still waiting for him at home, if he went to dinner with a beautiful woman like Teacher Shen, he would have to kneel on the washboard when he went home.

After speaking, Director Wu said goodbye to Mr. Shen without refusal, and walked straight to the parking apron behind the general affairs building and got on his black Accord.

The four of them continued to walk along the boulevard, until they reached the fountain not far from the school gate, Shen Youyi stopped, her car was parked in the parking lot of the teaching building, so she had to go to the right, as for Cheng Mo, if they wanted to leave the school, they had to go to the left.

Just now, Shen Youyi also called Cheng Mo, Fu Yuanzhuo and Yan Yitong to eat together, but everyone felt that it was a little late, so Shen Youyi didn't force it, and it was time to part ways at this moment.

"I'll go to the parking lot to get the car, you guys go back quickly!Don't stay outside!" Shen Youyi turned his head to Cheng Mo and the three of them.

Shen Youyi's voice was not very loud, with an imperceptible slight tremor in the cool night breeze, Cheng Mo noticed that Mr. Shen's expression was a little subtle and unnatural when he looked at the deep and winding passage.

However, this abnormality can only be detected by people like Cheng Mo, who are accustomed to observing others, Fu Yuanzhuo and Yan Yitong didn't feel it at all, the two nodded to Shen Youyi and said "Okay", and then waved their hands and said, "Goodbye, Teacher Shen!"

Cheng Mo also said "Goodbye Teacher Shen" and followed Fu Yuanzhuo and Yan Yitong towards the school gate with slow steps, when Teacher Shen's light footsteps were about to disappear, he looked back at Teacher Shen's back, which had disappeared at the end of his vision.

Cheng Mo hesitated for a moment, stopped and said to Yuan Zhuo and Yan Yitong: "You guys go back first!"

Fu Yuanzhuo and Yan Yitong both looked at Cheng Mo in surprise, and Fu Yuanzhuo asked, "What's the matter?"

"I have something I want to ask Teacher Shen...."Cheng Mo said.

Yan Yitong turned around and was about to walk towards the teaching building, "Then let's go together!"

Cheng Mo hurriedly grabbed Yan Yitong's arm, "Don't go, there are too many people, I'm afraid that Teacher Shen will be inconvenient to say." ”

Fu Yuanzhuo instantly made up the reason in his mind, and suddenly said: "Oh! yes, do you want to ask Teacher Shen if he has a good relationship with those teachers in private? These questions are indeed a little difficult to say when there are many people.....

"You two hurry back and see you tomorrow." Cheng Mo turned around and walked briskly towards the teaching building, he didn't say yes or no, but it gave people the feeling that it was just acquiescence.

Yan Yitong pouted, slightly increased the volume and shouted: "Cheng Mo, see you tomorrow, remember to send a message if there is anything." ”

Cheng Mo didn't look back, just raised his hand and shook it in the air.

Yan Yitong looked at Cheng Mo's back and asked Fu Yuanzhuo with some concern: "Cheng Mo and Teacher Shen won't really meet that weird person who paints chalk, right?"

Fu Yuanzhuo hesitated for a moment and said, "This is unlikely, right?"

"What if, should we secretly follow up to protect Teacher Shen and Cheng Mo?"

"If it is discovered, it will be too embarrassing, right?" Fu Yuanzhuo said with a bitter face.

"What's embarrassing?" Yan Yitong asked puzzled.

Fu Yuanzhuo didn't know what to say, "It feels like I'm catching a rape?"

This kind of talk is really disrespectful to Teacher Shen and Cheng Mo, so he can only sigh and say: "Whatever you want, whatever you want..."

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Shen Youyi walked alone on the cement road with the shadows of the trees, there was no light in the teaching building with white tiles not far away, and the dead silence seemed to be a murder scene that often appeared in reasoning, thinking of the videos he had just watched and Director Wu's words, Shen Youyi shivered in the cool breeze, and couldn't help but put his hand into the small satchel on his waist and touched the electric shocker.

The sycamore tree on his side shook for a while, making a sound of knowing the rope, and Shen Youyi, who was a little frightened, hurriedly turned his head to look at the sycamore forest next to him, the place near the miserable white street lamp was empty, but it was dark in the depths, and he couldn't see anything clearly.

Shen Youyi felt that her heart was furious, as if something was lurking inside, and she was secretly observing her with a pair of empty eyes, she turned around and walked towards the teaching building faster, in order to comfort herself, she whispered to herself: "Remember this feeling." The next time I write about these spooky scenes, I'll be able to use it..."

When walking through the ramp next to the football field and arriving at the teaching building, Shen Youyi couldn't help but look in the direction of the classroom, and subconsciously looked directly at the position of the first (9th) class of high school.

Shen Youyi subconsciously looked up at the position of the second (9th) class of high school on the second floor, the white tiles glowed dimly under the moonlight, she was thinking about what the chalk drawing that was erased by Cheng Mo was what was painted?

Shen Youyi looked up at the teaching building in the dark from the bottom up, and felt that it was completely different from the daytime, without energy, like a bright animal nest on the outside and rotten inside, a huge mother nest that devoured youth and innocence.

At this moment, Shen Youyi inexplicably felt a little sad, and this sadness covered up her fear, so much so that she ignored that she had stopped, and stood in front of the teaching building that originally made her feel a little terrifying for a moment.....

"Teacher Shen, what do you see?" suddenly a faint voice floated out from the silence of the deep sea.

Shen Youyi seemed to be taken aback, she quickly took out the electric shock device from her bag, held it with both hands, immediately turned around, and pointed to the place where the sound came from with the electric shock device, "Who?"

Cheng Mo, who was standing at the top of the ramp, quietly looked at Shen Youyi who was within the range of a street lamp, and the white light ball stretched her shadow, "It's me, Cheng Mo." ”

Before Cheng Mo's words fell, Shen Youyi's defensive posture relaxed, she put the electric shocker back into her satchel, lost a breath, and smiled a little shyly, "I'm sorry, I listened to Director Wu's words just now..... Some were too nervous. After a pause, Shen Youyi asked with some confusion: "By the way, didn't you go back with Fu Yuanzhuo and Yan Yitong, why did you come here again?"

"Oh! Because I had a few questions I wanted to ask Mr. Shen, I deliberately chased after him. Cheng Mo said lightly.

"Is it about mysterious chalk drawings?"

"Hmm!"

"Actually, I don't know much..... Let's talk as you go....." At this time, Shen Youyi's tone of voice also relaxed, and there was no tension at the beginning.

Cheng Mo walked up and walked side by side with Shen Youyi along the main road on the periphery of the teaching building to the side building, and the parking lot was next to the side building.

"Cheng Mo, what do you want to ask? Teacher Shen must know everything and say everything!"

"Teacher Shen, you also like to watch reasoning, haven't you studied this strange event?"

"Of course I have studied, for a month I still dragged the college doctor to stay in the school with me, trying to catch that boring person, but it was a little embarrassing! I confidently said that I wanted to solve the case, but I didn't even find any clues.....

"Didn't find any clues?"

"Actually, this incident also hit my confidence in writing reasoning, I know that the other party must have used some tricks to create an 'impossible secret room', but I just can't crack it, maybe I'm really not suitable for writing this reasoning!" Shen Youyi said in a somewhat low tone.

"Don't be discouraged! Sister Xi, there are only those so-called secret rooms, such as the vexatious type in Edgar Allan Poe's "Maori Street Bloodshed", such as the bag drop type in Seiichi Morimura's "The Dead Spot of the High-Rise", like the spatial geometry type in Kanedaichi's "Lucia Doll Murder", like the psychological action type in Agatha's "Evil in the Sun", like the reverse thinking type in Jiro Akakawa's "The Reasoning of the Tricolor Cat" and the special skill type in "The Murder of the Missile Trap House"..."

"We have eliminated a few impossible items according to geographical factors, and only the psychological action type and the special skill type remain....."

Just as Cheng Mo was speaking, Shen Youyi heard what seemed to be a little sneaky not far away, she listened vigilantly, and then quickly pulled Cheng Mo behind the plane tree beside her, and whispered: "There seems to be someone behind...."

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