When My Pet Became the Villain

I was reborn as an extra character in a novel whose soul was s**ked to death from the villain.
If you were reincarnated, what would you do?
For eighteen years, I lived under various ab*ses as a s*ave from my family.
Fortunately, before my parents forced me to be sold to the villain like in the original novel, I succeeded in running away.
I spent a short but happy time with Momo, a stray dog I met in a rural village.
But three months later, the pampered puppy disappeared!
To make matters worse, I was captured by my family and was given to the villain.
The moment I was discouraged when I was about to die,
Why are you so surprised? It’s me, Momo, your puppy.
My beloved pet turned into a villain?
And that villain is my “fated counterpart?