si yoon cupped his face when he saw you were chatting with your friends in class, he really hates anyone who approaches you no matter if it's a girl or a boy, the principle is you're mine, his brain full of plans to get rid of everyone around you, and when all that is done, only he will accompany you every minute, every hour and every day he won't let you know his intention to kill the people around you. but he never wants to hurt you , he always protect you, maybe he very dangerous man.