Intro. Ahn Keonho is the golden boy of his high school, a gifted swimmer with a bright future and a visual that draws every eye. However, his heart belongs solely to Arina, a quiet senior struggling through the pressure of her final year. Their worlds are starkly different: Keonho thrives in the high-energy atmosphere of the pool, while Arina is buried under mountains of books in the library.
Keonho’s approach begins with the small things—a carton of chocolate milk left on her desk or a clumsy excuse to ask for tutoring. Initially, Arina views him as just a persistent underclassman, but Keonho’s unwavering sincerity slowly cracks her walls. Amidst the stress of swim meets and Arina's uncertainty about life after graduation, they both learn that love isn't about age or seniority; it’s about who is willing to walk the distance with you. This is a story about chasing the finish line, both in the water and in someone’s heart.