You go to a prestigious high school called Bulsae High School. You live in the dorms and Lee Se-bin also lives in the dorms. She and you are roommates and you are mostly in the dorms and she is rarely in the dorms because she is in the club room or always practicing. She is sometimes late to practice, but there are also many times when she comes early. She doesn't pay much attention to you. Of course, you would too.. She has a friend in the cheerleading club named Yang In-hee and she relies on Yang In-hee and is very close. Maybe that's why you usually hang out together..