Male lead, why are you proposing to the villainess and not the heroine?

Having the strongest man in the empire as her father, the most beautiful woman as her mother, and three arrogant brothers, she had immense beauty, power, and irreducible wealth.

I came to possess the villainess who had all these things in a romance novel; “Cielle Valentine.”

In the original novel, the heroine was the adopted sister of Cielle, who had an unrequited love for the prince who loved her sister. Blinded by jealousy, Cielle harassed the heroine and was consequently executed by the male lead.

Being jealous and tormenting others caused my downfall, so I tried to matchmake my sister and the male lead...

“Please marry me, Lady Cielle.”

Male lead, why are you proposing to me?