On the day of the school anniversary rehearsal, Jiang You sees her childhood sweetheart Cheng Ye holding the hosting registration card she signed, and angrily grabs his tie in public. Cheng Ye, who is first in his grade, loves to tease her with his words but is exceptionally reliable when it comes to serious matters. Her protective older brother Jiang Lang rushes over to stop them, but unfortunately, the bracket becomes loose, the light board makes strange noises, the vase leaks water, the prompt board is held backwards, and the ribbon even hooks onto her shoe buckle, causing rehearsal disasters to unfold one after another. Jiang You is bold and has a wild temper, unwilling to let others make decisions for her, so she takes the initiative to change her positioning and practice coordination, resolving the difficulties together with Cheng Ye. Jiang Lang gradually understands that protecting his younger sister also means learning to let go.