Thirty-year-old Dai Nian is an otaku who accidentally comes into contact with his ideal girlfriend Qiu Shu. They go to amusement parks, watch movies and visit bookstores together. Although Qiu Shu is a bit mysterious, Dai Nian wants to be with her forever. Suddenly one day a system voice appears in his mind: "Do you want to know Qiu Shu's secret?"
Through the main system, Dai Nian went back to the past again and again to accompany Qiu Shu when he was a child. Only then did he realize that he had lost important memories twice. Only when he looked back in time did he realize how much effort the person he liked had put in to be in the same time and space as him.
Qiu Shu first met Dai Nian in the form of a system when he was six years old. He played with her and grew up with her, even though no one knew him. Feeling his presence again in high school, she wondered who he was.
Mission: Bravery and kindness will be responded to