Zhang Ruonan, a 28-year-old workplace social worker, had an accident while working overtime late at night and traveled back to his high school days 10 years ago. The once ignorant and cowardly scumbag has now returned with mature wisdom and insight. This time, she was no longer willing to be bullied or let regrets happen again. From overcoming obscure mathematics, physics and chemistry, to defeating the bad classmates who once bullied her; from making up for the regrets with her family, to encountering the heartbeat of youth. Zhang Ruonan overcame all obstacles and achieved great results in the college entrance examination, and was admitted to the ideal Wuhan University. However, just when she thought her life was complete, fate threw up a new puzzle. A choice between the past and the future was waiting for her...