Sang Zhi has been in love with Duan Jia Xu since she was a little girl; he was a boy who often came over to her house to play in her older brother’s room. He is seven years older than her. He later becomes her private tutor because she’s a hopeless case at school. But then, for some reason, they lost touch. After graduating from high school, she enrolled in college in the same city where he was living, and as they interacted daily, they slowly fell in love.