While delivering coffee to a high school event, Xu Yongxin spots posters for a speech by Zheng Dawei—his long-lost classmate. Overwhelmed, he scribbles a note on a receipt, trusting Dawei will recognize his handwriting, and arranges a post-event meeting.

Mornings are chaos for the Seo siblings: Yong Xin struggles with her wild curls while Yong Yi, annoyingly flawless, nags her to hurry. At school, delinquent heartthrob Du Yaxiu’s sudden return causes a stir—Yong Xin assumes he’s here for her, unaware he’s actually hunting the mysterious note-writer (her). Too late, she realizes her coded letters are missing.

Yongxin’s peaceful school life shatters when Yaxiu starts treating her like a personal assistant—forcing her to do his homework, clean his desk, and even buy his meals. Classmates whisper about their odd dynamic, while Davy grows furious watching her suffer. Unable to bear it, he confronts Yaxiu, demanding he stop tormenting the kind-hearted Yongxin.

After losing her notes, Yongxin gets trapped as Yaxiu's personal assistant while Davy unexpectedly bonds with him. Her suffering turns bizarre when class goddess Zhou YuXuan befriends her, suddenly elevating her social status. Now caught between Yaxiu's demands and new popularity, Yongxin navigates a confusing high school hierarchy where nothing makes sense anymore.

During morning cleaning, Yaxiu cruelly mocks Yongxin's fashionable new hairpin, saying it doesn't suit her. Humiliated but unable to retort, Yongxin focuses on her secret mission - arranging a meteor shower date between Yaxiu and popular girl YuXuan, believing this might finally free her from being Yaxiu's unwilling servant.

When Yongxin sees Yuxuan's missing lucky string and brings Yaxiu breakfast, she assumes their meteor shower date worked and they're now dating. But Yaxiu continues treating Yongxin as his personal assistant, even trying to take her drink, despite Yuxuan's obvious girlfriend behavior. Yongxin grows increasingly angry and confused about where she stands.