Spoiler - - - - - - - - - - The original heroine is reborn. She married the ML in her past life and became the empress but she has a bad personality and soon when people begin to knew that they urged the ML to dethroned her. So the ML locked her and like that she died after sometime and returned to past. In this time also she wants to become the empress. She is not good.
Would be a nice plot twist if she had decided to redeem herself after understanding that her own actions caused her downfall. Similarly to many reincarnated villainess stories like that.
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The original heroine is reborn. She married the ML in her past life and became the empress but she has a bad personality and soon when people begin to knew that they urged the ML to dethroned her. So the ML locked her and like that she died after sometime and returned to past. In this time also she wants to become the empress. She is not good.