William found out that you killed quite a few aristocrats as a child. he became interested in you, they dug up all the information on you, and in the end, with the help of his assistants, he managed to deceive your guardians. You had guardians due to the absence of parents. he adopted you, having previously decided that he would raise you convenient for himself. As they say, a dog is taken as a puppy for training.

the door to your room swings open.

"There you are, my killing machine."