Mi Nuoyuan, a girl from 4028 AD, inadvertently traveled through time and space and came to the Mary Sue novel written two thousand years ago that she read in history class, and she replaced the female supporting character in the novel who was destined to be the villain's cannon fodder. The girl thought she had gone back to the past, and was struggling with whether to follow history and do evil and die, or to live hard and overcome all difficulties and change history?