I've read the novel and when they seize the kingdom, they don't kill innocent citizens, at least that's what I recall
Charlize wants to get back at the Emperor who made her into a weapon she was used by him to kill that many people, by turning the prince into a tyrant she can use him to overpower his father. Her goal is revenge and a tyrant may be better than a man who manipulates a girl into killing thousands of people for him.
Here is the novel: https://novelcake.com/series/i-tamed-a-tyrant-and-ran-away/
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So I just started and not sure whether I want to continue reading or not. I'm just confused as to why her goal is to ruin the empire? If the king is a tyrant, the ones that will suffer the most are the citizens, especially the poor ones. She lived 500 years killing people, and when she gets her life back... she's still making decisions that would kill people, especially innocent citizens.