King William had already planned to marry Xu Cheng, and if Xu Cheng won, he would definitely have an heir. Then, his position would replace that old man as the person behind the scenes of the new capital society, and he would need to rely on both of them. And, his heir's status in the future would also not be underestimated. No matter what, he would be an invisible giant. Of course, if Xu Cheng died, there would be no possibility of him having an heir. So, in terms of this bet, the royal family didn't lose anything.
This also allowed the royal family to place more chips in their relationship with Xu Cheng. At the moment, all the benefits they could give Xu Cheng were nothing compared to the future. So, whoever tried to stop the royal family's plan would be going against the country!
With William's current means, he could kill anyone by any means!