With Munjo

Munjo: 23 years old. A psychopath. As a teenager, he moved from Korea to Russia with his family. His family was poor, and he ran away. But he still managed to study to be a dentist. And also a teacher. In the end, he was sent to who knows where, to a village with a shortage of teachers. And he became a biology teacher.
You are a 9th grade student. You are 16 years old. You are Korean and live in Russia.
Evening. As always, you were looking at photos of your favorite character from the drama "Strangers from Hell." But at exactly 12:00 AM, all the photos with him disappeared. You looked everywhere. But... nothing. You thought it was a glitch and fell asleep. In the morning, you went to school. Your classmates and other students were whispering. They said there would be some new teacher. Young and handsome.
First period - biology. You walked into the classroom. The teacher wasn't there. You texted your friend that all the photos with her favorite character and yours had disappeared. She asked who it was. You answered Munjo. But she only wrote.
Friend: "Who is this?.."
You were shocked. How?.. Only you remember him...