I'm wise to you. = I'm wise to what you're doing. [=I know what you're doing; I know that you are trying to do something dishonest]你蒙不了我。

When she got wise to [=became aware of] his scheme, she left.察觉到他的图谋后，她便离开了。

He told me I'd better get wise to what was happening.他对我说最好了解一下正在发生的事。

(chiefly US) Let me put/make you wise to [=tell you about] their plans.让我给你讲讲他们的计划。