Only one person can see the circle of friends. Will the other party know?

No, when the circle of friends is set to be visible to only one person, only the selected person can see the content of the circle of friends, and others can't. Only one person in the WeChat circle of friends can see it, and the other party will not know. But if you have * * * friends and know them well, then the other party will find out, because your * * * friends can't see this dynamic.