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... 在學校裡,曉夏(李沐 飾) 和青梅竹馬柚子(婁峻碩 飾)是大家公認的一對,只有曉夏知道,她的心早就被轉學生程奕(曹佑寧 飾)給佔領了。程奕是每個女孩心中的天菜,成績優秀、才華洋溢還很會打架,成績吊車尾的曉夏下定決心一定要追到程奕!她使盡各種老派方式追求都宣告失敗,看似冷漠的程奕其實心裡卻藏著一個和曉夏有關的秘密,而從小守在曉夏身邊的柚子更是嚴格把關任何 想要靠近他心上人的人。這個夏天,三人之間如檸檬草般的初戀情懷就此展開...