We asked you to solve cases, and here you are sharing your criminal experiences?

Song Qianxia stuffed the signal detector into her pocket, leaned on the edge of Zhou Xiaoyu's desk, and tilted her head to examine the items on the desk.

The desktop is very clean.

On the left is a stack of media studies textbooks, in the middle is a laptop, on the right is a plastic pen holder full of markers, and there is also a minimalist eye-protecting desk lamp with a white base.

That's strange.

Song Qianxia extended her index finger and tapped the plastic lamp arm of the table lamp.

"There's no Bluetooth or Wi-Fi signal transmission, and no infrared night vision illumination. Is there some invisible person living in this house, carrying a camera and standing on the table every day, filming my face?"

Zhou Xiaoyu's face turned pale at her words, and she subconsciously shrank behind Lin Wan.

"Senior, is this house really haunted? I'm too scared to stay here..."

Lin Wan glared at Song Qianxia: "Don't scare the child."

She turned around and gently comforted Zhou Xiaoyu: "Xiaoyu, don't listen to my colleague. Maybe that thing is usually dormant, or maybe you accidentally put it in the drawer."

"You should go back to the hospital to rest, or stay in a hotel for a couple of days. We'll then visit the other classmates who reported the incidents and do some cross-checking."

Zhou Xiaoyu nodded: "Okay, thank you both, seniors."

After leaving the School of Media and Communication, the two headed to the dormitory area of ​​Jiangcheng University of Science and Technology and the School of Foreign Languages ​​next door.

With Zhou Xiaoyu as a starting point, Lin Wan switched to her gentle senior sister mode.

He didn't wear a police uniform, didn't carry a notebook, and upon entering, he first offered the victim a hot milk tea before recounting his story of how a wealthy heiress could tear apart those spreading rumors.

Several girls who were originally crying their eyes out and refusing to even open the door immediately regarded Lin Wan as a confidante after hearing her story.

At 5 p.m., in a corner of the university town cafeteria, two people had two cups of milk tea and knife-cut noodles in front of them.

Lin Wan didn't even have time to eat; she laid out the visit records one by one.

"Three girls from three different schools, they don't know each other, and they don't even go to the same shopping districts."

"You've checked the computer and phone, they're completely clean."

"But all the secretly filmed videos were taken from a fixed camera position directly facing the desk."

Song Qianxia slurped up a big mouthful of noodles, her cheeks bulging.

"Sister Wanwan, did you take a picture of their desks just now? Let's put them in a row."

Lin Wan quickly took out her phone and pulled up the photos she had taken.

Song Qianxia leaned over and swiped the screen.

The first picture shows Zhou Xiaoyu's desk: textbooks, pen holder, computer, and white desk lamp.

The second picture shows a female student's desk at the University of Science and Technology: a mechanical drawing board, a snack box, a computer, and a white desk lamp.

The third picture shows the desk of a female student majoring in foreign languages: a cosmetics storage box, a calendar, a vocabulary book, and a white desk lamp.

When she scrolled to the fourth page, Song Qianxia's finger stopped.

The desk of this female student at the teachers' college was piled high with postgraduate entrance exam materials, and between two thick stacks of reference books stood a white desk lamp!

"Wait a minute!"

Song Qianxia stretched out her finger and tapped the upper right corner of each of the four photos one by one.

"Wholesale from the university town?"

Lin Wan carefully compared the information, then took out her phone and dialed the number of Chen Ting, the victim from Jiangcheng University of Science and Technology.

"Tingting, I have a question for you. Where did you buy that white desk lamp on your desk? Can we go over and take a look now?"

Ten minutes later, at the girls' dormitory building of Jiangcheng University of Science and Technology.

Chen Ting picked up the white table lamp from the table, her face full of confusion.

"Senior Lin, I just got this desk lamp about two weeks ago, and it's been working perfectly fine. Besides, you guys just tested it with the instrument, and it didn't alarm."

Song Qianxia took the lamp and weighed it in her hand.

It was heavy, much heavier than the ordinary table lamps they used at the municipal bureau.

The base is made of a single piece of die-cast aluminum alloy, without even a screw hole, fitting perfectly.

"Little sister, I'll take this apart. If there are no problems, I'll compensate you ten times the original price!"

Chen Ting waved her hands repeatedly, "No need to pay, no need to pay, officer, please do as you please!"

Song Qianxia found a fruit knife in the girls' dormitory.

Lin Wan reminded her from the side, "Be careful, this is physical evidence."

"Don't worry, it's professional."

Song Qianxia curled her lips into a smile, pressed her left hand on the lamp base, and held a fruit knife in her right hand, wedging the tip of the knife into the gap between the aluminum alloy base plate and the white plastic shell.

With a twist of the wrist, the base clips popped open.

Song Qianxia quickly ripped off the plastic casing, revealing the circuit board.

Inside the lamp holder, which should have contained only a simple transformer module, there was actually a tiny master control chip about the size of a thumb soldered on.

The camera lens was pointed directly at a small ventilation hole on the base of the table lamp.

Because it's covered with a one-way privacy film, the detector can't detect any reflections at all!

Chen Ting covered her mouth in fright, tears streaming down her face: "There really are cameras in here... there really are cameras in here!"

Lin Wan's face turned ashen: "No wonder the signal detector wasn't responding; this thing doesn't usually connect to the internet!"

Song Qianxia used her fingernail to pick up a yellow-green ribbon cable inside and clicked her tongue.

"The design is pretty insidious. This thing has a physical shield, so it's completely powered off and frozen normally. Even a god couldn't detect the signal."

She looked up at Chen Ting: "Little sister, which shopping platform did you buy this broken light from? I'm going to go and drag the boss back!"

Chen Ting shook her head, crying, "I didn't buy it! It was a free gift for checking in on the Qingniao Study Room app!"

"Check-in?"

Lin Wan and Song Qianxia exchanged a glance.

Sobbing, Chen Ting took out her phone and opened an app with a green bird icon.

"This learning software was incredibly popular last month on the confession wall and part-time job groups in the university town."

"It says that as long as you use the video check-in function on the software for 30 consecutive days, and spend at least two hours a day on it, you can redeem a smart sensor eye-protection lamp worth 399 yuan for free."

"Many of my classmates who are preparing for graduate school entrance exams downloaded it; it took me a full thirty days to receive it!"

Chen Ting became increasingly distraught as she spoke:

"We all think this desk lamp is incredibly smart. Every time we open the study app to start studying, the lamp automatically turns on, so we don't have to manually press the switch. My roommates all praise it for being so high-tech..."

After listening, Song Qianxia sighed.

"The most expensive things are the free ones; the ancients were right."

She put her laptop on the table and took out a data cable to connect to Chen Ting's phone.

"Come, let me see what kind of wicked schemes are inside this little bluebird."

With her fingers flying across the keyboard, Song Qianxia had completely dissected the installation package of Qingniao Study Room in less than three minutes.

"Good heavens, this is a prime example of false advertising."

Song Qianxia pointed to the few lines of core code that had been decompiled on the screen and explained them to Lin Wan.

"This software wasn't developed by any legitimate company at all; the servers are all located overseas."

"The video check-ins for the first thirty days were actually a 'selection of concubines' process for the criminal gang!"

"They used the front-facing camera to filter out female college students who were good-looking and usually wore pajamas in their dorm rooms, and then specifically flagged their accounts!"

Lin Wan gasped: "You mean, as soon as you open the app to study, it starts taking pictures secretly?"

Song Qianxia shook her finger.

"What's the point of filming someone reading while you're studying? This software will use the phone's gyroscope, microphone, and light sensor."

"When it detects that a user is walking around in the dormitory, there is the sound of running water, or the phone is left on the table after 10 p.m. but the lights are on in the room, it will determine that the victim is changing clothes or washing up."

"At this point, the pinhole camera in the lamp will be powered on and start recording five to ten minutes of high-definition video."

"When the user opens the app to check in again the next day, the lamp will secretly transmit the encrypted video recorded the night before to the user's phone cache via Bluetooth, and then upload it to an overseas cloud server using the user's mobile data!"