The Return of the Legendary Programmer – Chapter 46: The Professor

Chapter 46: The Professor

Kim Taesik listened without interrupting for twenty-seven minutes.

That was, by Dojun’s calculation, the longest Kim Taesik had ever gone without speaking in any conversation—academic, professional, or personal. The man who had a comment on everything, who could not let a flawed argument pass unchallenged, who had once interrupted a visiting Nobel laureate mid-sentence to correct a citation error—that man sat in his office, behind his desk, with his terrible coffee growing cold, and said nothing.

Dojun told him the same story he had told Hana and Seokho, calibrated for the audience. Not the emotional version (Hana) or the analytical version (Seokho), but the academic version: a careful, chronological account of two lifetimes, presented with the rigor of a research paper and the vulnerability of a student who had been hiding something from his mentor for five years.

When he finished, the silence continued for another thirty seconds. Kim’s coffee machine gurgled in the corner. A bird sang outside the window. Campus sounds drifted through the glass—footsteps, laughter, the distant construction that had been “temporary” for six years.

“The branch prediction paper,” Kim said finally.

“What about it?”

“The Hennessy flaw you identified. You said you found it through careful reading. In truth, your team at Prometheus Labs discovered it in 2014. Eight years from now.”

“Yes.”

“And the KETI optimization. The power consumption reduction. That wasn’t derived from first principles—it was recalled from professional experience.”

“Yes.”

“And every insight you offered in my seminars, every question you answered in my lectures, every paper you wrote under my supervision—all of it was, to some degree, informed by knowledge from a future that hasn’t occurred.”

“Yes. But the execution was mine. This life’s mine. The simulations were real. The code was real. The data was real.”

“The data was real. The context was borrowed.” Kim picked up his coffee, sipped it, set it down. “I’ve been your mentor for five years. In that time, I’ve written recommendation letters, co-authored papers, and staked my professional reputation on your abilities. How much of what I praised was genuinely yours, and how much was… recalled?”

The question was fair. It was also the one Dojun had feared most—not from Hana, who valued intention, or from Seokho, who valued results, but from Kim Taesik, who valued intellectual honesty above all else.

“The knowledge was recalled,” Dojun said. “The application was new. The Hennessy flaw existed in both timelines—I just found it earlier in this one. The KETI optimization used the same physics in both timelines—I just had more experience with the problem space. The papers, the presentations, the research—every result is reproducible, verifiable, and genuine. What’s different is the starting point. I didn’t start from ignorance. I started from experience.”

“Which you concealed.”

“Which I had no way to explain.”

“Which you chose not to explain.” Kim’s voice was not angry. It was precise—the particular precision he used when deconstructing a flawed argument, not to attack it, but to understand it. “You had five years to tell me. Instead, you told me ‘I read a lot’ and let me build a narrative around your abilities that was, at best, incomplete.”

“If I had told you the truth in 2006—’Professor, I’m a sixty-three-year-old time traveler’—what would you have done?”

“I would have sent you to the counseling center.”

“Exactly. The truth was unsayable. So I said the closest thing to the truth that was believable: that I was a gifted student who thought about these problems obsessively. And you believed it—not because I fooled you, but because it was partially true.”

“Partially true is not true.”

“No. It’s not. And I’m sorry.”

Kim was quiet again. He stood and walked to the window—his thinking posture, the one he adopted for difficult calculations. Outside, cherry blossoms were blooming for the sixth spring of Dojun’s second life. The same trees, the same petals, the same campus—but seen now through the lens of a confession that had stripped away five years of careful pretense.

“Seokho knows?” Kim asked.

“Yes. I told him last week.”

“His reaction?”

“He said it was his hypothesis number four.”

“Of course it was.” A faint, involuntary smile. “That man has a hypothesis for everything.” The smile faded. “And Hana?”

“She was first. Two weeks ago. As I promised.”

“You promised her first. Me second.” He turned from the window. “I accept the order. Partners before mentors. That’s appropriate.” He sat back down. “I have two questions. One professional. One personal.”

“Ask.”

“Professional: Your published work—the ISCA paper, the SIGCOMM paper, the pathfinding paper. Are the results valid? Would they hold up to replication by someone who doesn’t have future knowledge?”

“Yes. Every result is based on simulations and experiments conducted in this timeline, with this timeline’s tools and data. The insights came from my experience, but the evidence is original.”

“Then the publications stand. The knowledge may be borrowed, but the science is sound.” He made a note—the professor’s reflex, recording a judgment for the record. “Personal question: In your first life, what was I to you?”

“My mentor. The man who believed in me when I couldn’t explain why I deserved it. You gave a eulogy at my sixty-fifth birthday celebration. You called me ‘the most gifted student I ever failed to properly teach.'”

Kim’s hand stopped writing. “Failed to properly teach?”

“Your words. You felt that you had supported my abilities but not my character. That you had helped me become a great engineer but not a good person.”

“And were you? A good person?”

“No. Not in the first life. I was brilliant and unkind. I achieved everything and cared for nothing.” He met Kim’s eyes. “In this life, you asked me the same question—are you a good person?—during my first semester. I told you I was trying. I’m still trying.”

“The trying is the answer, Park.” Kim set down his pen. “I can’t pretend this doesn’t change how I see you. Knowing that your abilities come from experience rather than innate genius—that changes the narrative I’ve been telling about you for five years. It changes what I recommended, what I praised, what I held up as evidence of what my program could produce.”

“Does it change whether the work was valuable?”

“No. The work was valuable regardless of its origin. But it changes the story of the worker.” He paused. “I need to think about this. Not for long—I’m not the type to brood. But I need to reconcile what I believed with what I now know.”

“I understand.”

“Come back next week. Same time. Bring coffee—the good kind, as always.” He stood, signaling the end of the meeting. Then he paused. “Park. One more thing.”

“Yes?”

“In your first life—at the birthday celebration—did I say anything else? Besides the ‘failed to teach’ line?”

“You said you were proud of me. Despite everything.”

“Despite everything.” Kim nodded slowly. “I imagine I am. In both timelines. Despite everything.” He opened the door. “Get out. And don’t tell anyone else without talking to me first. Three people knowing is manageable. Four or more is a press conference.”

“I’m not telling anyone else. Just Hana, Seokho, and you.”

“Not your mother?”

Dojun paused at the door. “My mother doesn’t need to know. She doesn’t need an explanation for who I am. She just needs me to show up on Saturday.”

“That,” Kim said, “is the wisest thing you’ve said in five years. And it has nothing to do with future knowledge.”

---

The week passed. Dojun returned to Kim’s office on the following Tuesday, coffee in hand. Kim was at his desk, reading a paper, a stack of graded exams beside him. The scene was so normal—so unchanged from any of the hundred visits Dojun had made over five years—that the confession felt, for a moment, like something that had happened in a dream.

“I’ve thought about it,” Kim said. He didn’t specify what “it” was. They both knew.

“And?”

“My conclusion is this: You are, in the strictest sense, the most successful case of academic fraud in the history of Seoul National University.”

Dojun’s stomach dropped.

“You brought knowledge from outside the academic system, presented it as original work, and received recognition for insights you did not generate through the conventional educational process.” Kim’s voice was level. “By any standard of academic integrity, what you did is disqualifying.”

“Professor—”

“I’m not finished.” He held up a hand. “That’s the strict interpretation. Here’s the practical one: you used your knowledge to produce genuine, reproducible, valuable research. You mentored students, contributed to the field, and built a product that helps people. The ‘fraud’—if we call it that—harmed no one and benefited many.” He sipped his coffee. “I am a professor of computer science. I evaluate work by its quality and impact, not by the biography of its author. Your work is excellent. Your impact is significant. The fact that your biography is… unusual… does not change that.”

“So you’re not—”

“I’m not reporting you to the academic integrity committee, if that’s what you’re asking. Partly because the violation is unclassifiable—there’s no category for ‘knowledge obtained through temporal displacement.’ And partly because—” He paused. “Because you’re the most important student I’ve ever had. And I’d rather help you use your second chance well than punish you for having it.”

Relief flooded Dojun’s body like warm water. “I don’t deserve—”

“Stop telling me what you deserve. I’ve been deciding what my students deserve for twenty-five years. You deserve a mentor who tells you the truth: your abilities are extraordinary, your ethical situation is unprecedented, and your mother makes the best japchae in Namdaemun Market.” He extended his hand across the desk. “Welcome back, Park. Same as before. But with less pretending.”

Dojun shook his hand. Kim’s grip was firm—the same grip as five years ago, on the day he had offered a research position to a sophomore who knew too much.

“Now,” Kim said. “Tell me about Prometheus Labs. The real version. I want to know what you built in the life before this one.”

“That’s a long story.”

“I have terrible coffee and the entire afternoon.” He poured two cups. “Start from the beginning.”

So Dojun did. He told Kim Taesik about Prometheus Labs—the founding, the growth, the innovations, the failures, the cost. He told him about the AI framework that changed the industry, the patents that defined a decade, the company that grew to ten thousand employees and never once felt like home.

He told him about the hospital room, and the last line of code, and the comment that nobody would ever read.

And Kim listened, with his terrible coffee and his sharp mind and the quiet, fierce loyalty of a mentor who had chosen to believe in a student not once but twice, across two lifetimes of impossible choices.

The cherry blossoms fell outside the window. The campus hummed. The story—the real story, unedited, unfiltered, complete—filled the office like sunlight, and the professor who had been carrying half the truth for five years finally held the whole of it.

And it was enough. It was more than enough.

It was exactly what a second chance was for.