The beautiful and intelligent girl Xiaoyan has lived with her sister since she was a child. Although she is recognized as the school beauty, she is just infatuated with the cool senior who not only has a girlfriend but also only treats Xiaoyan as her younger sister. Xiaoyan, who was still a bit childish, realized the taste of love for the first time, but she didn't want to disturb his life and just stayed by his side silently, because she knew that he loved his girlfriend. Who knows, in the end...