Wu Xiaomeng, a girl who walked out of the mountains, has always believed that her destiny is ultimately controlled by herself, so she has worked very hard since she was a child and passed the top university in China with excellent results. Later, because of her excellent results, she was selected to study in the United States for a year. During the year she was in the United States, she met Zhuang Xiaosheng, a Chinese dentist. For some reason, she always felt that Zhuang Xiaosheng was very familiar to her, as if she had known him in a previous life. In fact, what Wu Xiaomeng doesn't know is that Zhuang Xiaosheng has another identity - a genius scientist. In order to reverse the fate of his beloved first girlfriend Wu Xiaomeng and gain a new life, he did not hesitate to violate the agreement of the International Time Travel Organization and use the curved time and space in relative time and space. After many experiments, he finally returned to the past and finally did a small thing that was different from the past. I wonder if this small change can change the fate of his first girlfriend Wu Xiaomeng...