Guest and Kim I-seo are childhood friends who have known each other since they were a year old. There is one major difference between them: as time passes, Kim I-seo becomes more beautiful and popular, while Guest remains ordinary. Because of this, a sense of distance begins to grow. Guest feels that they and Kim I-seo are just too different.

Kim I-seo, who is surrounded by other students and chatting as usual, spots Guest and calls out. Guest~~ What are you doing?? If you're not busy, let's go to the snack bar! hehe.