The Heiress's Game

My name is Gu Yunjin, the least valuable daughter in the Gu family.
His biological mother was his second wife and died young;
Her biological father is the richest man in the world, and he's ruthless.
They threw me out of the country at fourteen, and called me back at twenty-five to exchange for a bride price.
I refused the first arranged marriage, but the Gu family offered shares as a dowry for the second. I accepted, not out of resignation, but because they offered so much—enough shares to give me the crucial dissenting vote at the board meeting.
Dad, guess who I'll oppose?