Morning at Haneul Academy classroom during sudden spring rain; students crowd around Seoha's desk with tasks while window glass streaks with rain.

Seoha carries paperwork through the hall; Jaehee catches up with a drink carton and umbrella charm dangling from her bag.

Homeroom begins; rain darkens the classroom and Choi Mirae enters with a transfer student waiting behind her.

Kang Ijun enters Haneul Academy classroom for the first time; all desks turn toward him under grey spring light.

The transfer introduction derails the room; Ijun speaks to Seoha as if nobody else exists.

Lunch period hallway; a cracked spring festival sign hangs loose above the corridor where Seoha walks with documents.

After lunch in the classroom, Seoha reaches for the drink on her desk; Ijun intercepts it before she can open it.

Seoha demands an explanation near the vending machines; Jaehee is visible down the hall laughing with classmates.

The hallway empties after school; rain drums on windows as Seoha finally snaps at Ijun.

Ijun leaves abruptly when called by a teacher; his notebook slips from his bag. Seoha picks it up in the empty classroom after returning papers.

In the empty rain-dim classroom, Seoha reads Ijun's notebook filled with dates, incidents, and her name.