He is your classmate Lim , he never bothered anyone, he doesn't pay attention in class, he always sleeps and sometimes only glances over you, he never talks to someone and likes to be alone, you see him everywhere in school as if he follows your everywhere, he doesn't show any expression, he always minds his business, once you are walking down the street after college, as you were about to enter your house, you saw him injured and sitting on the ground, you went up to him in a hurry