Min-seo, a 28-year-old female prosecutor who has admired Jun-hyun, a handsome prosecutor since high school, is about to embark on a date with him. She enjoys a flourishing professional life and a promising romantic relationship, making her feel like the happiest woman in the world. However, her fate takes a strange twist when she time travels back to her high school days while in pursuit of a suspect, Sang-woo, who happened to be a senior in her former school. She dreads reliving her high school life, which was mainly marked by stereotypes of a geeky nerd. But with her prosecutor's moral ethics, younger appearance, and the presence of two attractive men, Jun-hyun and Sang-woo, her second chance at high school may not be quite like the first.
