On Wednesday night, Fu Liangtao asked Ah Yu to join the investigation of the Daoist class. In this investigation, Ah Yu is in charge and tries to attract Xu Jingjia's attention to see if she really came to the Taoist class to meet the opposite sex.

The classroom is a conference room where students sit in a circle around a long table. When Ah Yu arrived, most of the classroom had been filled, and Xu Jingjia had not yet arrived.

The little girl who was close to Xu Jingjia looked around, and when Xu Jingjia arrived, she and her mother led Xu Jingjia to sit down in front of the door, and Xiao Si saw a new clock installed on the door.

Interestingly, before starting the class, the instructor also deliberately introduced the new bell to the students.

The little girl was as close to Xu Jingjia as ever, but Xu Jingjia's attitude was not as warm as what Fu Liangtao heard and saw before. During the whole process, Xu Jingjia didn't squint, just listened to the class, listened extremely attentively, and was lukewarm to the little girl's closeness. Unmoved by Ah Yu's temptation, he even seemed to be a little displeased.

The second half of the class introduces the service work that students can participate in. Listening to this, Xu Jingjia's expression gradually became dull, and her smile became less and less. Fu Liangtao only said that Xu Jingjia may have been listening attentively for a long time and began to lose concentration.

After the end of the class, Xu Jingjia suddenly walked out of the classroom, quickly walked through the round arch, stopped a taxi directly in front of the door and jumped up.

It all happened quite suddenly, without warning.

Fu Liangtao noticed that something was unusual, so he immediately drove up from behind, and explained to Lian Jingrong and said, "Ah Yu, I'll follow and have a look first. Do you know what's going on?"

"No, I don't know what's going on, and I didn't see Xu Jingjia answer the phone beforehand." Ah Yu replied.

Because of this answer, Fu Liangtao denied Xu Jingjia's conjecture that he left because of a sudden accident, but he had no clue why Xu Jingjia was so anxious. Fu Liangtao's car followed Xu Jingjia's taxi, and it was not until the scenery around him gradually became familiar that Fu Liangtao guessed that Xu Jingjia wanted to go home.

I saw Xu Jingjia walking slightly after getting off the taxi. Compared to before jumping into the taxi, her pace was noticeably slower.

This discovery instantly killed Fu Liangtao's original expectations.

Fu Liangtao looked at Xu Jingjia's figure from a distance and subconsciously squinted his eyes. He recognized that he was in a rather passive state.

Although he has been engaged in cybercrime investigation for many years, Fu Liangtao understands that this is a common difficulty encountered in related work. The main reason for this is that there is often a gap between the time of the crime and the time of revelation, which gives the prisoner enough time to destroy the fragile and volatile evidence.

However, it was the first time that Fu Liangtao had encountered a suspect who had built a thick wall for himself. Xu Jingjia is hidden in the wall, and this wall is as impregnable as a copper wall.

After the past week's integration plan, Fu Liangtao found that the chances of finding flaws and breakthroughs from her were quite slim by sending people to get close to Xu Jingjia, and the time cost required was too high. Xu Jingjia was too defensive of others, Fu Liangtao tried to approach as a female and male investigator respectively, but found that Xu Jingjia was equally defensive of both, and Xu Jingjia's defensive heart would not be swayed because of the gender of the person.

In order to increase the efficiency of the investigation, Fu Liangtao decided to add a more primitive method, Sniffer.

Network listening tools are divided into two types: hardware and software, and this time Fu Liangtao used the hardware version that needs to be installed on the door. Compared to investigating the billing records of an ISP, a network listening tool can achieve more detailed and accurate results. Because the vendor's billing records may still be disguised by the user's cunning, the hardware version of the network listening tool is directly integrated with the user's network, and all data must pass through this tool when entering and exiting. Therefore, the network monitoring tool can capture the data transmitted in the network, accurately capture the data packets in and out of the network, and conduct real-time network monitoring for users.

Moreover, this primitive method has another advantage, that is, no matter how good Xu Jingjia's skills are, she will not be able to detect them.

In this way, even if Xu Jingjia really has other hidden electronic devices, once they are used, they have no shield.

After a short time, Fu Liangtao chose a lift that was not commonly used by Xu Jingjia and took it to the higher floors. Then, Fu Liangtao came from the stairs of the fire escape to the floor where Xu Jingjia lived. Fu Liangtao put down the toolkit slightly, put on his gloves, and just as he was about to install it, he took a closer look, but found that someone had already completed what he wanted to do before him.

Fu Liangtao's first thought was Zhou Maoxing, but the next moment, Fu Liangtao denied this hypothesis. Fu Liangtao knew very well that Zhou Maoxing's technology was not enough to deal with network surveillance tools, and if Zhou Maoxing had enough ability, he would not have been asked to investigate in the first place.

Fu Liangtao saw that the model and style of this tool were no worse than the ones he used, and from this point of view, the other party should also be a person familiar with this way, but he didn't know whether the other party was a policeman, a private detective, or someone else.

Fu Liangtao thought about it, installed a camera in the hidden position in this box, and half-unplugged the wiring connected to the network monitoring tool, but did not completely unplug it.

After all this was done, Fu Liangtao quickly returned to the car and shelved the plan to install a network listening tool.

Fu Liangtao couldn't wait to turn on the laptop and set up the relevant settings, hoping to complete it before the other party came to check.

Even if Fu Liangtao only thinks about it with his tail finger, it is clear that the existence of this network listening tool proves that someone is monitoring Xu Jingjia's network activities in real time. Fu Liangtao suddenly remembered Zhou Muqing's investigation of Xu Jingjia.

However, Zhou Muqing has been dead for more than a month, and the investigation work is to collect the deposit before settling, if the other party does not receive the balance payment for more than a month, it is reasonable to end the investigation tool and recycle the network monitoring tool.

At present, the network monitoring tool has not been recycled, which means that the investigation work of the other party is not over.

This time, who will be investigating Xu Jingjia?

Fu Liangtao's doubts about Xu Jingjia are getting deeper and deeper, why are so many people so concerned about her dynamics?

Fu Liangtao waited in the car and waited, from almost six o'clock to nearly eight o'clock, but he didn't wait for anyone. If the other party is a private detective, the hiding place is likely to be nearby, and if there is a problem with the real-time monitoring instrument, it will inevitably go to check immediately.

The reason why the other party did not come to check was because he was already aware of it? So why don't you show up and avoid revealing your identity?

Fu Liangtao then carefully recalled in his mind the people who had appeared next to Xu Jingjia in the past few weeks when he had been following and approaching Xu Jingjia. Fu Liangtao searched for dry intestines, but he didn't seem to find any relevant people, so he couldn't help but suspect that the other party might just monitor Xu Jingjia online.

Fu then went to Hui Ching-ka's estate management office to extract the relevant CCTV records, and then drove back to the police headquarters full of doubts.