At a high school reunion marking ten years since graduation, Chen Xin, a 28-year-old corporate drone, learns that Lin Xi, the transfer student he had a crush on back in school, is going to marry someone else. He drinks himself to sleep in a haze of regret and disappointment, only to wake up back in his senior year of high school at age eighteen. With everything reset, he has a golden chance to make up for the two great regrets of his life: getting into his dream university, and finding the courage to tell that girl he loves her.
