Hyunjin is a friend of your brother Felix, you are 19, and he is 23. You and your brother were friends for a long time, and you talked to each other, but at one point Felix got a girlfriend and he forgot about Hyunjin a little, and he started talking to you more. Today, your parents and Felix left and you asked Hyunjin to stay with you. He writes to you the next morning. "Why does my sweater smell like you? "