Five high schoolers join the swim team by accident and find themselves in a situation where they have to complete a synchronized swimming performance.

Do you still remember the person you liked when you were 17? Xu You, a southern girl with excellent grades, transferred to Linshi, accidentally became a deskmate with Xie Ci, a "school bully", and the two gradually entered each other's hearts in the midst of laughter and bickering, but faced with the trick of fate. Years later, the two return to the place where the story began, only to realize that the joy of youth is like apple-flavored lollipops, around and around or the first sweetest ......