Chapter 1: First Mistake

The classroom buzzed with noise.

"Did you hear? New professor today."

"Yeah, I heard he's strict."

"Relax, How bad can it be?"

The door opened.

Silence.

A man walked in_ calm, expressionless.

He placed his file on the desk.

"I'm Min Yoongi."

No smile.

No pause.

"Your new mathematics professor."

A few students straightened immediately.

Yoongi picked up a piece of chalk.

"If you are here to waste time, leave now."

No one moved.

"Good," he said flatly.

He turned to the board and wrote a complex equation.

"This is where we start."

A student whispered-

"Start? That's not start, that's death."

Yoongi stopped writing.

"Say it louder."

The class froze.

"... Nothing, sir."

"Focus on the board."

Chalk tapped once.

"I don't repeat explanations."

"I don't tolerate carelessness."

"And I don't give marks for effort."

Each word felt heavier than the last.

Then-

The door opened.

Everyone turned.

Jimin stood there, slightly out of breath.

"... Sorry, sir."

Silence.

Yoongi didn't turn immediately.

"You're late."

Jimin lowered his gaze.

"I'm really sorry. May I come in?"

A pause.

"No."

The word landed sharply.

A few students exchanged looks.

Jimin blinked.

"... Sir?"

Yoongi turned slowly.

His eyes were cold.

"First class. First day. And you are already late."

Jimin tightened his grip on his bag.

"It won't happen again."

No response.

Just silence stretching.

"... Please, sir."

Another pause.

Then-

"Last chance."

Jimin quickly stepped in.

"Thank you, sir."

He moved to another empty seat, aware of everyone watching.

Yoongi turned back to the board.

"Name."

Jimin looked up.

"Jimin."

Yoongi repeated it quietly-

"Jimin."

Then continued writting.

"Solve this."

No explanation.

Just the equation.

The class stayed still.

No one volunteered.

Yoongi looked around.

"No one?"

Silence.

His gaze stopped.

"Jimin."

Jimin froze.

"... Me, sir?"

"Come here."

He stood up slowly and walked to the board.

Yoongi handed him the chalk.

"Start."

Jimin stared at the equation.

"... I'll try."

"Don't try. Do it."

Jimin swallowed.

"First... we differentiate this part..."

He wrote carefully.

A whisper came from behind-

"He just came and already in trouble."

Jimin ignored it.

He continued.

Step by step.

Then-

"Stop."

Jimin's hand froze.

Yoongi stepped closer.

"What is that?"

Jimin looked at his work.

"Sir... I thought-"

"You thought?"

The room went silent again.

"Math is not about what you think."

Jimin's fingers tightened around the chalk.

"I can fix it."

"You already made a mistake."

Jimin erased quickly.

"Let me try again."

"Why?"

Jimin looked at him.

"... Because I want to get it right."

A pause.

Something unreadable crossed Yoongi's eyes.

Then-

"Do it."

Jimin started again.

Faster.

More careful.

His heart raced.

"Wrong."

The word hit harder this time.

Jimin's breath shook.

"... Just one more-"

"Sit down."

Silence.

"You're wasting time."

Jimin lowered his hand slowly.

"... Yes, sir."

He walked back to his seat.

Whispers followed.

"Told you."

"First day itself."

Jimin stared at his notebook.

The same equation.

Same mistake.

"... Where did I go wrong...?"

At the front, Yoongi spoke again-

"Next."

But for a moment-

his eyes flickered toward Jimin.

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