The Heroine has an Affair with my Fiancé [Harper Group Version]

Ciella Lavirince, an extra that meets the guillotine execution ending in the original novel.
Once I've posessed her body, I twisted the original novel under a single thought that I won't have my head chopped off.
Without knowing even in my dreams that it will become this twisted!

"Ciella, I fell in love with young master Esset. Even so, we're still friends, right?"

No wait, just why would the female lead have an affair with my fiancé? She's supposed to fall in love with the Crown Prince!

Since it's become like this, how about scrapping the playboy shitty car and pulling in a foreign car?
And so in a fit of anger, she sends a letter to the Crown Prince.

[How about having a revenge affair between people who've been cheated on?]

But this, somehow worked?

A never before seen revenge affair political drama filled with pure love(?)!