During the summer of his junior year in high school, Woo-Yeon (Kim Young-Kwang) spends his time getting time into fights. He isn't interested in studying. He then meets new transfer student Seung-Hee (Park Bo-Young) and falls in love with her at first sight. Seung-Hee though isn't interested in Woo-Yeon. To avoid the other male students, Seung-Hee and Woo-Yeon pretend to date. Seung-Hee also asks him to stop fighting. He keeps his promise and their relationship develops into a real romantic relationship. One day, Seung-Hee calls Woo-Yeon and tells him to take care.