Inspired by a televised high jump competition, Korean-American teen Goo Jae-Hee becomes determined to help her athletic idol, Kang Tae-Joon, regain his form after a career-halting injury. Disguising herself as a boy, she transfers to the all-male Genie Physical Education High School in Korea. From the moment she stumbles into Tae-Joon on her first day, Jae-Hee finds herself navigating strict teachers, awkward dorm life, and intense sports training, all while trying to keep her true identity hidden. As Jae-Hee grows closer to Tae-Joon, the once-cold athlete begins to open up, finding strength and healing through their unlikely friendship. Meanwhile, her classmate and soccer ace Cha Eun-gyeol wrestles with confusing feelings for the “boy” he’s slowly falling for.