Kim Bok-joo (Lee Sung-kyung), a 21-year-old student in the weightlifting department of the Sports University, is a girl who strives to run towards her dreams and goals. Although she looks very frivolous, she has a soft heart of glass. By chance, she meets Jung Joon-hyung (Nam Joo-hyuk), a male classmate in the swimming department of the same school, a swimming genius who is not so lucky, and thus begins a romantic first love story.