Interesting Historical Romance (manga)

I was reincarnated into the body Cecilia Silvie, the villainess of an otome game.
According to the plot, what awaits me in the normal route is either a slow, painful death or an instantaneous one... Essentially, every route leads to my demise.
Then I'll change my fate! And that's why I decided to become a man.
However, I made a mistake during a certain event, and the story began to head down an unexpected path...?

Violette, a proud and beautiful daughter of a duke, commits a crime out of jealousy towards her half-sister. Convicted, Violet faces her own heart with sincerity in a prison cell and regrets her sin. Then time rewinds to a turning point—to her first meeting with Maryjun one year ago.
Violette makes a decision. She will not make mistakes this time. Without committing a crime and bothering anyone, she will live an ordinary, plain and inconspicuous life...! However ...

The poor aristocrat Viola suddenly received an unexpected marriage proposal from the prestigious noble household of Duke Physalis. An average noble daughter and the handsome duke. She had been confused, thinking that nothing made sense, but the duke had his own personal reasons. A political marriage with ulterior motives, both having their own circumstances. Will this path lead to happiness or sorrow?