A mediocre twenty-five-year-old woman, living like a zombie in the reinforced concrete city. I don't even dare to admit that I wasted my youth and failed to become the person I wanted to be, nor the person my parents wanted me to be. One night, I was rejected by my mother again. I went out for a walk in the evening, but I accidentally witnessed the door of time and space opening. I returned to my 15-year-old self and became my 15-year-old self... I am back to adolescence again! ! ! I can do things I regret not doing at the time! I want to study hard, fall in love early, refuse bullying, and become the self of my dreams! Will the 25-year-old me living in a 15-year-old body regain this courage?