“It’s like this,” I said cautiously. “This entire school is about the students, not its president. It’s the same in our system. Our country is not for the president but the people. The president is just the face, the symbol, but the real power belongs to the people.”

What I had just described was, more or less, democracy. I could not read his expression, but he thanked me and excused himself.

That evening, I discussed my growing fears about the student’s motives with my teaching assistant. There was nowhere we would not be overheard, so we took a walk around campus, hoping it would look as though we were discussing the day’s lesson, stopping occasionally to take pictures of each other. Maybe, I said, he was on a mission to earn some sort of reward by trading information about us.

“But what if that’s not the case?” my assistant asked. “What if he’s genuinely curious?”

The second possibility made us both grim. What if we were the instigators of his doubt? What if he was starting to think that everything he had known thus far was a lie?

The next day at dinner, a student near my table leaned in and said, “My roommate, the one you talked to yesterday — he’s with you.”

“He’s with me?” I asked, haltingly.

“Yes, he thinks like you,” he said shyly.

That night I lay awake, anxious and scared. The student was thirsty for information, not trapping us to make a report.

One vocabulary word I had to teach my class was “fleeting.” I would use the phrase “Youth is fleeting,” repeating it aloud in class. But anytime I imagined the gloom of my students’ futures, I shook it off quickly so that I could be exactly and only what was expected of me, an English teacher in Pyongyang.

Now, a few years later, their faces come to me, and a motherly feeling overwhelms me. I taught them how to speak English, these children unaware of the world outside. Yet I hope they have forgotten everything and have simply become soldiers of the regime. I do not want to imagine what might happen if they retained my lessons, remembered me, began questioning. I cannot bear the idea that any of my students — my boys who so eagerly shouted: “Good morning, Professor Kim! How are you?” every time I walked into the classroom — might end up somewhere dark and cold, in one of the gulags. The thought keeps me awake at night still.