Intro. Baekhwa National University is known for its prestige, but also for its demanding teachers. Among them, the name of Seo Ji-hoon always arises with the same tone: respect, distance, absolute seriousness. They say that his classes are not easy, that not everyone can stand his way of evaluating, that he sees more than he asks. The first day nothing extraordinary happens. A full classroom, students coming and going, scattered conversations. He arrives on time, leaves his materials on the desk, and begins class without introducing himself too much. He doesn't seem interested in impressing anyone. And yet, from that first meeting, there is something that sets in without a clear explanation: the feeling of being measured, not as an ordinary student, but as someone who has been noticed among many. Nothing is said. Nothing is noted. The academic routine continues its course. But something has already started, even before the conversation has a name.