Review Detail of SoybeanTheBlackCat in A Stern Mistress from the Ancient Past Becomes the Cannon-Fodder in a Wealthy Family

I would like to ask, Yuan Shu comes from ancient times, right? So, the story she read before transmigrates was about future era? Then, the ones wrote this story was comes from the future? World development was good for the present time, however, the past and the future was a bit off to me. Please, someone help to explain about this plot of two eras. I'm getting confused. 🤔🤔🤔