Carrying the endless regrets of his previous life, Lin Zhou stands at the starting point of the final 100-day countdown to the college entrance exams, knowing better than anyone how much this year matters. In his previous life, he obsessively pursued the school's most beautiful girl, neglected his studies, and let down someone who genuinely cared for him. Reborn, he cleverly turns an embarrassing incident around during the flag-raising ceremony and refuses to repeat his past mistakes. After becoming desk mates with Xu Nianchu, he quietly looks after the girl struggling with financial difficulties. Together, they form a study group and support each other. The once-troubled student rapidly improves his grades, while Xu Nianchu gradually breaks free from the chains holding her back. Ignoring the distractions around them, they promise to attend the same university. Through the passionate and unforgettable days of their final year of high school, they accompany each other and rewrite their destinies.