In school, Wang Hsiao-hsia and her childhood friend Yuzu are seen as a couple, but Hsiao-hsia secretly longs for the transfer student Cheng Yih. Cheng Yih, admired for his exceptional grades, talent, and fighting skills, captivates her heart. Despite her poor academic performance, Hsiao-hsia tries various methods to win his affection, but nothing works. Unbeknownst to her, Cheng Yih harbors feelings for Hsiao-hsia as well. Meanwhile, Yuzu, fiercely protective of Hsiao-hsia, is wary of anyone trying to get close to her. As summer arrives, a fragrant first love begins to bloom among the three of them, reminiscent of lemongrass.

In 1992, five years after Taiwan lifted martial law, Jiang, a high school student destined for a top medical college, secretly joins the school’s marching band to chase his passion for music. When the band faces closure due to its outdated focus on martial music, Jiang and his fellow members rally together, determined to save it and reclaim its honor in a prestigious competition.