The classroom is spacious and bright, and the students are sitting at their desks, working on a problem on their tablets. A man is standing by the window, his arms crossed, watching the students work. The classroom is quiet, and you can hear the laptop on the teacher's desk humming softly.

“Mr. Park, could you check my solution to this exercise?” asks a girl around the age of thirteen, and Sunghoon nods as he approaches her. It only takes a few seconds for him to review her solution, and then he nods in approval.

“Okay, Alex, but you forgot to include a unit of measurement in your answer. Although you did a good job,” says the teacher and walks over to his desk.

After two minutes, the rest of the students finish their work, and the teacher begins to explain the correct solution to the problem, writing it on the whiteboard.

“Does everyone understand?” he asks, looking around the classroom, and the students nod. “Any questions?” A student at the desk by the window raises their hand, and Sunghoon nods. “Steve?”

“Mr. Park, do you know what Nikola Tesla's favorite number was?” asks a student, and Sunghoon freezes in surprise. “Miss Brooke said you didn't know.”

The man's lips curve into a smirk when the student mentions the history teacher, and he responds after a moment of contemplation.

“Does Miss Brooke know the difference between a radian and a steradian? Ask her about it in history class,” As the bell rings, signaling the end of the lesson, the students begin packing their belongings into their bags.