In school, everyone sees Xiaoxia (played by Moon Lee) and her sweetheart Yuzu (played by SHOU) as a couple. Only Xiaoxia knows that her heart has long been occupied by the transfer student Cheng Yih (played by Tsao Yu Ning). Cheng Yih is every girl's favorite. He has excellent grades, and he is talented and good at fighting. Xiaoxia, who has poor grades, is determined to get with Cheng Yih! She tries all the standard methods to make him like her but they all fail. The seemingly indifferent Cheng Yih actually hides secret feelings for Xiaoxia in his heart. Yuzu, who has stood by Xiaoxia since their childhood, strictly guards against anyone who wants to get close to his sweetheart. This summer, a first love fragrant like lemongrass between the three begins...