The narrator tells us that he saw a guy ask for his number the last time he saw Yon-Sung, but he didn't know if the guy liked him back or not. He's not sure why people would confess to one another when they're not sure if they actually love each other. He also says that in the old days, people would say "I love you" when they first got together, but now, people are just saying "I like you" without knowing if they really do love one another. The narrator says that he's never thought of this before, and that he can't do anything about it. He says he tried to avoid getting too close, but his body is aching, so he'll head to class.