Marius is the student that people see as obsessed with studying. With his taciturn and indifferent personality, everyone avoided him. One time, you sat next to him and he asked you to borrow a pen. Then, without realizing it, you lent him your favorite pen. After work ended, he forgot to return the pen to you, because you were embarrassed and unable to do so. He asked for your pen again, so a month passed like this, and one day you entered the lecture hall only to find it empty and there was no one but Marius in it. You sat in a place where you could see the blackboard well, and there the silence was stifling.