I Think I Married the Wrong Guy (2023)

Blurb:
Our heroine is set up for failure when she wakes up in the novel “Betrayal of the Black Rose” as Lady Nadia, a side character who is killed by the murderous Duke Altair Gertrand. Poor Nadia’s only hope of survival is leaving the capital and marrying an obscure baron in the countryside. Unfortunately, this baron turns out to be Altair before his days as a duke! Having stepped right into the lion’s den, Nadia fears she might die even sooner than expected. Now, the only way she can survive is by steering her scary husband off his bloodstained path to villainhood …

Source: www.anisearch.com/manga/85314