There's a girl who is Duke's wife but the Duke is in love with her sister but still married the MC because of political reasons. In her first life when she hears that her sister died, she smirks and when the Duke comes home, he pins the blame that the MC was the reason her sister died and she is sentenced to prison. Then she is reborn after dying in the prison on the same day when Duke and her sister meet for some tea for the first time. This repeats several times where she tries to win the love of the Duke back but fails.
In some of her rebirths, she meets a creature which first appears to her as a crow but can change into other things too. She waits for him in her every life but he shows himself only in some of them.
As that hell continues to happen, one day she notices the Duke is doing something different from her previous lives but as it turns out, Duke also started to have conflicting but his body would move the same way as always even if he didn't want to.