Curly love

Busan, 1998. High school student Park Sae-ri decides to break her rule — not to ask guys out first — for the sake of a handsome schoolboy. To prepare, she needs to straighten her hair, and the salon with a guarantee belongs to the mother of Yun-seok's new classmate. In exchange for a free procedure, Se-ri begins helping Yun-suk, who recently broke his leg.