Moon Jae decides to run away from home with Yu Jeong. Moon Jae and Yoo Jeong, who were riding a motorcycle, get into a car accident, Yoo Jeong suddenly disappears, and time jumps back to 2015.

Moon Jae goes to 2015 and meets Sa oh, who calls him dad. As time goes by, he meets Yoo Jeong, who has grown older, and sees Full Moon in a vegetative state. If you want to turn back time, you have to find the full book.