“The dot product of two vectors is a scalar, calculated as: a·b = |a||b|cosθ. It can be used to calculate the magnitude of vectors, the angle between them, and to determine whether they are perpendicular to each other…”
On the lecture platform, the math teacher, already over sixty with thinning hair, was holding a long pointer and vigorously tapping the geometric figures on the blackboard.
His voice was broken and hoarse. Although his pitch fluctuated greatly, the content he delivered was still enough to make people drowsy.
“Yawn…”
Su Wanli rested her head limply on her folded arms, lazily yawning at the blackboard, feeling that her upper and lower eyelids were starting to get intimately close to each other uncontrollably.
‘So… so sleepy… It’s only the second class, but I’m already starting to struggle.’
Su Wanli rubbed her sore eyes, then shifted her gaze away from the dizzying lines and formulas on the blackboard, turning it listlessly toward the window.
The sky was still a clear blue, with a few white clouds drifting lazily across it. On the playground in the distance, a few students in PE class were chasing and playing. Their laughter, even through the thick glass window, reached Su Wanli’s ears clearly.
‘…So noisy. I want to kill nine people… No, I mean, I want to find nine people and take them out, just to give myself a quiet sleeping environment…’
‘Oh, right? Actually, if I think about it, I just pulled an all-nighter…’
‘It’s all that Meng Wange’s fault—her behavior is always so calm and uneventful, without a single ripple. She made me spend the whole night wondering what her attitude toward me really is…’
‘Fortunately, now I have the data panel. Although I still don’t know exactly what those data correspond to, at least I now have a way to bypass Meng Wange’s smile and directly peek into her heart.’
Thinking of this, Su Wanli unconsciously glanced sideways at the brown-haired girl sitting upright beside her.
Meng Wange maintained her standard, impeccable posture of an honor student. Her back was straight, a black gel pen held between her fingertips, and she was meticulously recording something in her notebook.
Sunlight streamed in through the window, falling on her smooth, light brown hair, making her always smiling profile look even more delicate and perfect under the sunlight, like a carefully carved piece of art.
‘…Damn, even in math class she’s so serious. How is her brain wired? Does she really find some unique pleasure in these boring numbers?’
Su Wanli silently grumbled inwardly as she shifted her gaze to the semi-transparent virtual panel in front of her.
Appetite: 5 → 7 (+2)
②?: 50 → 48 (-2)
③?: 12 → 15 (+3)
④?: 65 → 66 (+1)
⑤?: 0
‘Hmm, none of the data has changed significantly…’
‘From morning until now, only the first and second data have changed a lot; the last three are like stagnant pools, completely still…’
‘Come to think of it, Meng Wange is just having a normal class. There’s nothing here to cause her emotional fluctuation. If I really want to make them change, I’ll probably need something more special, something more stimulating…’
“…Next, let’s look at the scenarios where vectors can be applied. For instance, in this coordinate system…”
The math teacher’s modulated voice rang in Su Wanli’s ears again, like a roaring truck, making her eyelids heavier, and her consciousness was being pulled away like silk threads, sinking into a warm and drowsy darkness.
‘Ah… I can’t… can’t take it anymore. So sleepy. I’ll just go ahead and sleep…’
Just as Su Wanli was about to lose consciousness completely, she mustered her last shred of spirit and cast her gaze back at Meng Wange’s data panel.
â‘¢?: 12 → 15 (+3) → 18 (+3) → 23 (+5)…
The numbers on the third line seemed to be rising slowly but steadily, at a visible pace.
‘This… this is!?’
When the value had unknowingly climbed to nearly 40, not only had the number changed, but Meng Wange’s body seemed to be affected as well.
Her originally straight back began to curl slightly. Her usually clear and bright eyes were now squinting a little. Even the speed at which she took notes had slowed down.
â‘¢?: 27 → 30 (+3) → 38 (+8)…
Meng Wange finally frowned. Then she raised her index finger, gently pressed it against her high nose bridge, and closed her eyes.
â‘¢?: 38 → 32 (-6) → 24 (-8) → 16 (-8)…
After more than ten seconds, Meng Wange suddenly opened her eyes, as if realizing she had lost her composure. She shook her head sharply, took a deep breath, and slightly stretched her body, trying to wake herself up again.
‘…This is it!’
Su Wanli, who had been on the verge of sleep, suddenly slapped her thigh, a flash of insight in her eyes.
‘I get it! The meaning of this third data is Meng Wange’s “sleepiness”!’
[Ding-dong—Congratulations, Host. You have successfully deciphered another piece of the heroine’s internal data.]
The moment Su Wanli had that thought, the System’s voice rang in her ears.
[That’s right. After System verification, this third data indeed represents Meng Wange’s “Sleepiness Value.” The higher this value, the sleepier Meng Wange is; the lower this value, the more awake and energetic she is!]
“Haha, hahahaha!”
“So that’s it! This task isn’t difficult at all! In just two classes, I’ve already cracked two-fifths of this encrypted panel!”
“The first data represents appetite, and the third represents sleepiness. By that logic, the other three data should be similar—emotions that arise in normal human life, right?”
Su Wanli raised the corners of her mouth smugly, turning her head to look at the brown-haired girl beside her who was still struggling against sleepiness.
“But I see. So this is what Meng Wange meant when she said she’s ‘good at covering up her fatigue in various ways.'”
“Her sleepiness had already reached over forty just now, and yet by just rubbing her nose bridge and closing her eyes to rest for a dozen seconds, she forcefully dispelled her drowsiness. Is this the legendary Main Heroine’s halo?”
Su Wanli cast a glance of both reverence and sympathy at Meng Wange.
Of course, the sympathy and reverence lasted only a moment. The next second, Su Wanli was smug again.
“Hehe, Meng Wange, Meng Wange, it seems your inner activities aren’t that hard to read after all! As long as I use my brain more often and pay attention to your state, even I can see what you’re thinking…”
“So next, let’s see what those remaining three stubborn data really represent.”