Does wujun know that this department is Blackwater?

In the animation God Bless the People, Huacheng didn't know that the local division was disguised by Blackwater. Blackwater's disguise is very effective, and the identity of the local branch is completely filled by him. Even Wu Jun entrusted him with an important task. If the real cause of his death has nothing to do with the Feng Shui master, I think the black water may be hidden in the sky.