On the first day of junior high, 13 year old Li Li meets the handsome but cynical Pei Shang Xuan. A homely girl and a handsome boy, an academic achiever and a poor student - they would never be the kind of enviable match made in heaven. For the next 15 years, Li Li was Pei Shang Xuan's one, unchanging friend, and Pei Shang Xuan was the one and only person Li Li loved. As the years pass by, Shang Xuan begins to realize how important Li Li is in his life. But their love isn't something that can continue in this lifetime.