Born on the same day and raised side by side, high school students Yoon Hae-Rim and Uhm Ki-Seok are close friends. They never say it, but they are precious to each other. One day, a transfer student from Seoul comes. Oh Dong-Kyung is bold and not afraid to say what he is feeling, unlike Hae Rim and Ki Seok. Is Dong Keung enough to shake up their friendship?