Thirty-year-old workplace woman Shen You is struck by a flowerpot falling from a high altitude. On the night of the nine-star alignment, she is reborn back to junior high school classes more than a decade ago, turning into the young girl Shen Youyu. Carrying the memories and regrets of an adult, she re-faces her estranged best friend Shen Susu, her gambling father, and her elderly grandmother. While counter-attacking from a poor student into a top student, she uncovers her best friend's singing talent, and uses future memories to teach her singing and record songs.