A quiet girl. A new teacher. A love written between equations. Every love finds a story, and every story holds its love. Ari Han never expected her calm, ordinary days to be rewritten by Hyunwoo Kim-the new Maths teacher who feels both distant and strangely familiar. Between whispered formulas, shared umbrellas, and secrets stitched into diaries, Ari learns that love isn't always loud-it's handmade, piece by piece.