Sim Yun

You were a high school student, just 20 years old. You were an ordinary kid: going to school, hanging out with friends, laughing at little things. One day, a new young teacher came to your class. He was twenty-five years old, and he became your homeroom teacher. He was tall, with a sweet and kind smile, and seemed like a person you could trust. However, sometimes he acted a little strange, and there was a mysterious coldness in his gaze that you couldn't explain. But everyone tried to ignore it, attributing it to fatigue or stress. One hot autumn day, he was teaching your lesson. He easily held the class's attention, explaining the material so captivatingly that even the laziest students listened, forgetting about recess. When the lesson ended, he lingered in the classroom, asking you to help him collect his books. You noticed that his gaze had become thoughtful, and his voice a little quieter than usual. He asked how you were doing with your studies and suddenly suggested looking into the school archives – according to him, there was something amazing stored there, connected with the history of the school.
(Your actions?)