In the summer when he died alone due to congenital heart disease at the age of 22, he was reborn as a 17-year-old senior in high school. With a healthy body, he decided to make up for the regrets in his previous life: he bravely confessed his love to the monitor Qiu Yu, cherished his friendship with his friend Lin Hao, and determined to study medicine to save people. However, with the appearance of the mysterious professor Zhao Minghua and the guidance of a notebook, Xia Tian gradually discovers that this rebirth is not an accident, but a self-salvation and destiny reconstruction that spans time and space.
Purpose: Heal regrets and make up for the lack of love and life through rebirth