Searching for someone in northern Myanmar, and you call that earning tuition fees?

The sound of the school alarm shattered the afternoon tranquility.

Countless students poured out of the teaching building, their faces a mixture of confusion and excitement, like a flock of birds just released from their cages. They didn't know what was happening, only that it seemed like they didn't have to go to class anymore.

The windows of the lecture hall were wide open, letting in a cold draft.

Professor Wang Defa jumped from the building to escape. Although the second floor was not high, there was a soft lawn below, and the police's encirclement was a beat too slow, allowing him to slip into the green belt in a blind spot of the surveillance cameras.

Jiang Nanyan's face was ashen as she issued a blockade order into the walkie-talkie: "Notify the SWAT team to seal off all school gates. The suspect is extremely adept at counter-surveillance; do not alert the students. Plainclothes officers will conduct the search."

Mada slammed his fist on the wall beside him and growled, "Damn it, it's like a ghost!"

Su Ming sat in the chair, toying with the piece of chalk, his eyes calm: "He can't go far."

Jiangnan Yan turned around, her voice urgent: "Why?"

"He has severe mysophobia and obsessive-compulsive disorder about cleanliness." Su Ming pointed to the blackboard. "Just now, before jumping out of the window, he even instinctively avoided the dust on the windowsill. For this kind of person, if he doesn't clean himself properly after strenuous exercise and sweating, it's worse than killing him."

"And," Su Ming glanced at his watch, "it's 5:30."

Li Changfeng leaned closer: "What's up with 5:30? Are you off work?"

"It's mealtime." Su Ming stood up, patted his pants, and said, "For someone with obsessive-compulsive disorder and an extremely regular schedule, the time, place, and calorie intake of meals are unwavering rituals. He's still at school, and he's in the cafeteria."

Jiang Nanyan frowned: "But there are so many people in the cafeteria. He's good at disguise. He could be a cleaner or a student."

"He can't get rid of his obsessive-compulsive disorder." Su Ming slung his backpack over his shoulder. "Let's go to the first cafeteria. It's the only place in the whole school where the floor is mopped three times a day. He only eats there."

Jiang Nanyan immediately picked up the walkie-talkie: "All action teams, plainclothes officers infiltrate the first canteen! Repeat, plainclothes officers infiltrate!"

The group quickly moved away.

The first canteen was bustling with activity during the evening rush hour. The security department had already emptied a monitoring room on the second floor. Jiang Nanyan looked at the wall covered with monitoring screens; dozens of windows covered every corner of the canteen.

"The technical investigation team is conducting facial recognition, but if he has physically disguised himself, the system's recognition rate will drop." Jiang Nanyan looked at the densely packed heads on the screen, her scalp tingling. "This is like looking for a needle in a haystack."

"Don't look at the face, look at the soul." Su Ming sat in the control room, skillfully connecting to the monitoring system. "What we're looking for is a soul that has been twisted into a square."

Standing behind Su Ming, Ma Da watched his fingers dance across the keyboard and couldn't help but sigh, "Advisor Su, are we going to have to start checking who's responsible for eating and wiping the mouth this time?"

"That's called being hygienic, not obsessive-compulsive disorder," Su Ming said without turning his head. "Don't confuse a normal person with a madman."

At this moment, Li Changfeng pushed open the door and came in, his chest puffed out and his face serious.

"Report! Outer perimeter secured!"

Jiang Nanyan nodded: "Thank you for your hard work, Consultant Li. You can keep an eye on things from the outside."

"That won't do!" Li Changfeng waved his hand dismissively. "At such a critical moment, we must have someone specifically responsible for maintaining order at the scene to prevent the suspect from resorting to desperate measures and harming the future generations of our nation!"

As he spoke, he solemnly pulled a red armband from his pocket and put it on his arm.

The words "[Canteen Inspector]" were prominently printed on it in gold lettering.

The room immediately fell silent.

Jiang Nanyan's expression froze. After a two-second silence, she asked with difficulty, "...Advisor Li, is this your...combat equipment?"

Ma Da covered his face, unable to bear to look.

Is this old rascal here to be funny?

Su Ming stared at the screen and said calmly, "Captain Jiang, send two plainclothes officers with good mental fortitude to follow him. Don't let him go to the kitchen to direct the aunties serving food; it could easily cause a riot."

Li Changfeng glared: "How dare you talk like that! I'm going deep into the community! I have experience; as long as I'm there, I can spot anyone who dares to cut in line or waste food! Since the murderer has OCD, he definitely can't stand people cutting in line. This is called entrapment!"

Su Ming actually nodded: "That makes sense. Then go ahead, just stand at the top of the stairs on the second floor and be a mascot."

Li Changfeng smugly adjusted his red armband, turned, and went out: "Watch closely, today I'll show you what top-tier security really is!"

Watching Li Changfeng's proud and arrogant back, Jiang Nanyan sighed and whispered into the microphone, "Groups three and four, keep an eye on that guy with the red armband. Don't let him get into a conflict with the students. If anything unusual happens, just... never mind, just take him away."

"receive."

Silence fell again in the monitoring room.

Su Ming's gaze darted rapidly between dozens of images, searching for any clues.

"Excluding area A, that person smacked his lips while eating; the killer couldn't stand that kind of noise."

"Excluding the guy in the white T-shirt in Zone C, the culprit couldn't have remained so calm after having oil splattered on his clothes for three minutes without wiping it off."

"Exclude table B5; that couple was using the same pair of chopsticks, the killer would vomit if he saw that. Next."

"Let's rule out that lady whose hands shake when serving food... never mind, we don't need to rule her out."

Time passed second by second.

Jiang Nanyan's palms were sweating with nervousness. If the murderer wasn't in the cafeteria, or didn't come today, the trail would go completely cold. And that madman could launch another "trial" at any moment.

"Team Leader Jiang."

Su Ming suddenly spoke, pressing the pause button.

The image freezes on a food serving window in the corner of the cafeteria.

"Found it."