This book is a female channel novel. The protagonist Shen Siyun, female, is 14. After failing to confess her love, she went to the rooftop and pretended to jump off the building but accidentally traveled through time. When she was 18, she got used to high school life and walked with her friends. There is also a childhood sweetheart and Tiansheng who are jealous of each other. The heroine is both correct (meaning that she does not choose one of the two, the life of a pure heroine) is academically successful, a group favorite, and a sand figure.
Purpose: Probably to make up for the regrets of youth