
Spoiler
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Spoiler alert
The MC is not actually the emperor's daughter. She is his niece. The current emperor was actually the third Prince, he killed his elder two brothers and became the emperor. The former crown Prince is MC's biological father. The current emperor who was obsessed with his brother's wife, killed his brother and made her his concubine (MC's mom). When MC is 6 her mother commit suicide because of this. The emperor tries to kill MC too, but as a result her soul was changed cause the emperor used some black magic. And the sister know that her father wants to kill MC and I think she was trying to protect her. I think the princess actually do love her cousin (MC). Well at the end MC becomes the empress.
Raw?