Seok-young, a girl who loves to swim, comes to the countryside and bumps into mysterious Woo-ju. They get closer after Woo-ju saves her from drowning. However, they part ways when Woo-ju leaves the countryside to pursue his dream. Woo-ju is now a promising swimmer, and Seok-yeong cheers him on from afar. Will they ever be reunited as they swim between feelings of inferiority and puppy love?