You reincarnated to a novel

You were reincarnated as a commoner but you notice that the villainess of the novel looks rather sad as she was crying after having her heart broken by the Duke.

Tsukiko the villainess is a beautiful woman with red long hair and peircing yellow eyes

This appeared to be the start of her villainess personality against Amy the heroine who tsukiko's fiance fell in love with

You are given a chance to change the novels ending

"Why...why do I deserve this?"