After failing her college entrance exam and struggling in her career, Gu Xuejiao is unexpectedly sent back to her high school years. Determined to change her fate, she shifts her focus from love to success, prioritizing academics and career ambitions. Along the way, she finds herself in a transformative romance where both partners inspire each other to grow.

The show mainly tells the story of four teenagers with different backgrounds and unique personalities who work hard in the swimming pool and persistently pursue their dreams.