I Don't Want This Bad Ending

In the famous romance novel «A Happy Ending» has a cliche plot of a heroine picking her favorite fish in the fishpond and becoming a happy female lead at the end of the story. The villainess, Evelyn Callie von Emsworth is the young lady of the Dukes House, a spoiled lady that craved for love, she bullies the heroine and died at the guillotine by the order of the Male Lead which she loves.While everyone had «A Happy Ending», only Evelyn was met with a tragic death.What will happen when a graduating college student died and become part of the famous novel «A Happy Ending» and became the tragic villainess of the story?Will she stay at the original plot?Or will she turn her fate and create another path?Will everything came to light and will the story deviate from the original?