Please recommend a fictional historical novel.

The protagonist looked exactly like the emperor in the virtual space. After the emperor died, the protagonist became the emperor. The original emperor was impotent. He had a mother, a sister, and a master who picked herbs for the emperor.
She had read the novel before, but she had forgotten most of the content before she finished it. He only remembered some scattered information.
At the beginning, the protagonist entered a non-existent dynasty and met the emperor and an old eunuch beside the emperor. The emperor was very young, about fifteen or sixteen years old, not even twenty years old. After the protagonist entered the capital, a fortune-teller saw him and said,"You're already the emperor, what's your fate?" Later, when the emperor was assassinated in the palace, the protagonist replaced the emperor and even slept with the empress. The main character had a younger sister. She could immediately tell that the Emperor was not her brother, but no one believed her. They knew that the Emperor was a fake. Only that old eunuch.
Her words were a little messy because she couldn't remember clearly.

Answer 1

I recommend " Zhao's Tiger " to you. This is a fictional historical novel that tells the story of the warring states and the contending of hundreds of schools of thought. I hope you like my recommendation.😗