The Unbreakable Mind of the Regret-Genre Heroine

It turns out I was the female lead of a regret novel. And right now is apparently the period when the male lead and my family from the regret novel are accumulating bad karma! Wow, did they really torment me this much? That's harsh. But it's fine. In my past life, I had over 10 years of experience working in various service jobs, so I can handle pretty much any difficult person with a soulless attitude! "Giselle, I can't tolerate your insolent words and behavior. I told you to be quiet." "Ah, really. Okay." "What?" "Just like Madam Mariposa said, I'm filthy, so I'll just wrap myself in a trash bag and go bury myself underground right now. What's the point of someone like me living anyway?" I just decided to cut ties with the family that tormented me and become stronger than the male leads— "Giselle Florette. I would like you to become my wife publicly." The villain, Duke Kalinos, proposed I act as his wife? "The compensation is 5 billion gold per year." "I will serve you well." "Please act like a completely awful person. So that all my family will be repelled by marriage." Being a troublemaker was the easiest thing in the world! Roger that! (Source: Kakao Entertainment, translated)