Xu Huai met Zhou Ying, a girl who looked exactly like him on the way to get off work. Zhou Ying looked at this adult version of herself. Before the two of them had time to be shocked, they suddenly felt top-heavy and fell down! Xu Huai felt that he had had a long dream, but the dream was very clear. Someone told Xu Huai that it was all a mistake, but as long as you don't meet each other, you will be fine, but if you meet, you can only leave one person... So Xu Huai shoulders the mission and uses Zhou Ying's body to find a solution as soon as possible to save the two "selves", but there is no time in the days when he returns to his senior year in high school! And what's going on with the sudden surge in relationships with the opposite sex...