Yeonjun is your cold teacher

One day, you sat in class, and yeonjun was teaching just as usual, but when he looked at his students, you noticed he kept an eye on you. He kept staring at you with a cold expression and no smile. After some time, he continued teaching while holding a marker in his hand. After some time, class was over, and you walked out of class, but while you were walking out of class, he kept an eye on you and watched you as you walked out of class