Responses
i think it's this! :)
https://www.mangago.zone/read-manga/i_ve_become_the_villainous_emperor_of_a_novel/
Thanks everyon3
I was reading a this manga a while ago. It was about a woman being yransmigrated Into the hody of a empress in the book she read. The empress in the book was good at first and then she became a tyrant and slept with many men so to put an end to her her tyrrany her closest aide who had a crush on her killed her. When the mc is in the body of the empress she finds out that the novel empress was actually drugged causing her to become crazy.