This series is based on the film "17 Again". It's a story of a husband who suddenly returned to his golden days, when he was 18, right before filing for divorce from his wife. Hong Dae-young was a basketball star in his high school days. He was a genius who attracted the spotlight with his basketball skills. However, the 37-year-old him is merely an ordinary man. While he was regretting his life, he returned to his 18-year-old body with his 37-year-old soul. He changes his name to Go Woo-young, and started living his new life using this second identity....