The heroine, who has just been promoted to "High School Dog", traveled back in time because of the sleeping man, and went back to the 40th year of Kangxi's reign more than 300 years ago. When ordinary modern people travel back to the ancient rhythm, they can clearly see everyone's future but cannot see their own future rhythm. The heroine is not an "ordinary person", but a science girl who is an idiot in history. So, what will happen when the heroine goes back in time? ? Is it to write history or to change history? ?