Burdened with a serious crush on her young homeroom teacher, 17-year-old Hong-yeon spends her spare time writing furtively in her notebook -- an assignment from the object of her affection. But when he begins eyeing up an older colleague, Hong-yeon finds her heart broken as one point of a jagged love triangle. Jeon Do-yeon , Byung-Hun Lee and Lee Mi-yeon co-star in this moving exploration of first love.