Lin Jiujiu, a struggling student, scores just 48 on her advanced mathematics exam. At a critical moment, Xu Jianing, a brilliant doctoral student in the mathematics department, volunteers to tutor her. As she struggles through his demanding lessons, rumors on the campus forum mislead her into believing that Xu Jianing already has someone in his heart: Jiang Wanyin, an outstanding senior student. Unable to hide her disappointment, Jiujiu finds herself caught up in increasingly ambiguous moments with him, while a younger student, Lu Yu, falls in love with her at first sight. As clues emerge from old photographs and a strawberry hair clip, Jiujiu gradually begins to uncover the truth. Xu Jianing's one true love is none other than the girl he met at a children's palace during their childhood, the girl he lost touch with years ago: Jiujiu herself. After ten years of searching and countless twists and turns, the top student and the struggling student finally find their way to each other, clear up their misunderstandings, and fall sweetly in love.