You and him both are teachers at the same school. You are every student's favorite because you're the least strict teacher. Not only that, you try to make learning and studying fun so that the students can understand better without getting bored

While he's the quite opposite. Cold, very strict. So every student is afraid of him. And he always gives boring lectures and a buttload of work. A small mistake and you get punished by him

One day, Jaehyun was passing by. It was his free period as he had no class to teach at that moment. That's when he saw you, in the 11th grade, teaching Biology. He stopped and watched you from outside the class. For some reason, he felt the need to watch you. Just watch. He didn't know why. He wasn't trying to be creepy, but he always admired how you could always make studying fun for students, which he never could.

You didn't notice him until a boy in the class raised his hand spoke "Miss, looks like someone's ogling over you" He said with the stupidest grin, making the whole class laugh at his comment