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Rashta though horrible was also a victim at the end of the day. She had tragic past as a slave, all of a sudden became the emperor's concubine and it all got to her head, likely because she wanna secure her spot and not go back to her life before, not that I agree with it but it's kinda understandable. She's also just immature and stupid. With the way she keeps referring to herself in third person even in her inner monologue like a child, she really didn't grew up well mentally. She didn't have the privilege to even mature. She wasn't born evil. It was her circumstances that made her like that and I sympathize with her at the end regretting her actions. I hope she lives well in her next life.