In fact, when Cheng Mo was a freshman in high school, the mysterious chalk painting was boiling, but the drawer didn't catch it for a long time, and the school forbade everyone to discuss it, plus chalk drawings often appeared, and gradually everyone lost their freshness, and after the students in the first (9) class of high school at that time were accustomed to it, there was no topicality.

At that time, Fu Yuanzhuo was in the first (9th) class of high school, so he knew about this matter relatively clearly, and after he roughly recalled some details in the office, he frowned and said: "It stands to reason that the prisoner should be easy to catch! He can only draw on the blackboard on Friday nights, Saturdays and Sundays, and the security guards only need to wait for the rabbit, how can he not catch it?"

"Maybe it's an insider, such as someone who knows about the school security department or someone from the school security department who committed the crime, so naturally it is impossible to catch it!" Yan Yitong raised a finger and said, after a pause, Yan Yitong looked at Cheng Mo again and said, "Do you say it is Cheng Mo?"

Cheng Mo nodded, "There is such a possibility." ”

Yan Yitong exclaimed, "Oh yes", as excited as if he had won the prize, "I am really a beautiful girl with both beauty and wisdom." Every great detective has a beautiful assistant, which is probably played by a woman like me!"

Leaning back in the chair, Fu Yuanzhuo, who was swaying gently with his feet, waved his hand, "My sister, don't think about other people so stupid, you can think of it, the people in the Ministry of Security will not think of it? Rationally speaking, it is too risky for an adult to do this, unless he is a pervert in real life, he will do this kind of thing that hurts others and is not beneficial to himself, and you have to pay attention to the fact that the theme of many paintings is 'teachers and students', and the prisoner is aimed at Teacher Shen, and if the prisoner himself is not a student, there is no need to always paint like this, right?"

Fu Yuanzhuo sat up straight and slapped the table, "To be honest, I think it should have been done by a classmate in our class..... Do you think it's Cheng Mo?"

Cheng Mo nodded, "There is such a possibility." ”

"I think we should start with the teacher or someone from the school security department!" Yan Yitong said with his hands on his chest.

Fu Yuanzhuo shook his head, "I think it should be checked from the original high school first (9) class, and I have always had a suspicion in my heart....."

Yan Yitong immediately forgot to argue with Fu Yuanzhuo, propped up the table with both hands, and asked with wide eyes, "Who?"

Fu Yuanzhuo hesitated for a moment before saying, "It's just a doubt!"

"If you can be sure, what else are we going to check!" Yan Yitong said angrily.

"I was a little suspicious that it was Ding Jiaye. Fu Yuanzhuo said.

"Ding Jiaye, which one?" Yan Yitong was not familiar with the classmates in the class, and asked with some doubts.

"It's the representative of the Chinese class in the class. Fu Yuanzhuo said.

Seeing Yan Yitong frowning and thinking about it, Fu Yuanzhuo said again: "It's the one who wears a pair of gold-wire glasses and drags the text all day long..... Last week, Mr. Shen read his composition, which was full of idioms. ”

Yan Yitong suddenly realized, "Oh! It turned out to be him?

"I used to sit in the back and see it clearly, he likes to take pictures of Teacher Shen secretly, and often secretly records videos during class, and his WeChat avatar is Mizuho Kazami in "Please, Teacher....."

Afraid that Cheng Mo didn't know who Mizuho Kazami was, Fu Yuanzhuo added: "Mizuho Kazami is the heroine of a teacher-student love cartoon, and she is a sexy alien female teacher. To be honest, I think "The Garden of Words" or "Love Tyrant" is much better than "Please, Teacher", "Please, Teacher" is too routine!"

Yan Yitong shook his hand, "I like "Teacher! Can I Like You", the live-action version of Ikuta Dou is really handsome and cool!"

"Teacher, Can I Like You" is too bloody, and it's just you little girls whose hearts explode ....." Fu Yuanzhuo knows why Yan Yitong likes "Teacher, Can I Like You", not only because "Teacher, Can I Like You" is a girl-oriented comic, but also because the male protagonist in it, Mr. Ito, belongs to Cheng Mo, a person with a character who is indifferent and meticulous in everything......

Cheng Mo coughed expressionlessly, Yan Yitong and Fu Yuanzhuo immediately terminated the discussion about the teacher-student love comics, and their faces returned to seriousness, so the problem returned to the original point again.

Yan Yitong looked at Cheng Mo and said, "Then where should we start?"

"According to the investigation process of ordinary cases, the first thing we need to do is to understand the facts of the case, in detail: when, where, by whom, for what purpose, and for what motives, what tools were used, and what consequences were caused to which goals. It is referred to as the 'seven elements' of the case. ”

After saying that, he moved his chair and stood up, walked to the whiteboard in the student union office, picked up a black pen in the stainless steel slot under the whiteboard, and wrote: "time", "place", "person", "motive", "purpose", "tool", "goal" seven words.

The slight friction between the pen and the whiteboard sounded in the office, and Fu Yuanzhuo and Yan Yitong had already turned to look at the whiteboard, as if they were listening to Cheng Mo's lecture.

"Time, did Fu Yuanzhuo know that the first chalk drawing was that day?" Cheng Mo asked back.

"Hiss....." Fu Yuanzhuo took a breath and recalled: "I remember that it was after the National Day of the first semester..... The first painting was a painting of Mr. Shen wearing a long skirt in the classroom, and at that time we thought that someone could draw so well and use chalk to draw Mr. Shen vividly....."

Cheng Mo wrote later in time: September 31, 2017 - October 12, 2018, and then said: "The time span is almost a year. ”

Then Cheng Mo wrote at the location: the classroom of the first (9th) class of high school and the classroom of the second (9th) class of high school.

Figure:?

Motivation: Crush, jealousy, or whatever

Purpose: To arouse Mr. Shen's attention, discomfort or other things

Tools: Chalk, chalkboard

Target: Mr. Shen

After writing it, Cheng Mo turned around and said: "What we have to do now is to collect clues according to these seven keywords, instead of guessing that person may have done it, and wait until there are enough clues to deduce who is the culprit." ”

Yan Yitong raised his hand, as if he had a problem in class.

Cheng Mo said "uh", "Just ask if you have anything, you don't need to raise your hand." ”

Fu Yuanzhuo glanced at Yan Yitong and snickered.

Yan Yitong glanced at Fu Yuanzhuo and asked, "Then how do we collect clues? It can't really be like what is played on TV, looking for fingerprints, footprints, and video recordings, right? By the way, aren't there monitors in the classrooms?"

Cheng Mo shook his head and said lightly: "In order to save costs, the monitoring in the teaching building must be turned off at night, even if it is not turned off, it depends on whether it has infrared night vision function, I guess it should not be, if it is, the prisoner should be easy to catch." ”

Fu Yuanzhuo nodded, "I also think that if the monitoring could be used, it is estimated that it would have been caught a long time ago..... By the way, there is another point that can prove that the students in the class did the crime, the classroom door lock has never been broken, so the other party can easily get the key.... Who is on duty in our class and who gets the classroom key, or can we start to check this aspect?"

Cheng Mo nodded, "This is a clue, but I think we should go to the Ministry of Security first and ask, since they have investigated this matter, then where should they have some clues to provide.....