Be wise after the event British idiom cliché
Usually used in this form: It's easy to be wise after the event.
To know and understand a situation only when it has already happened
Looking back to our plan, I think we should have made clear the fees, but it's easy to be wise after the event.
Since there has been a dog in my house, I couldn't believe it can cause me so many troubles, but it's easy to be wise after the event.
Completely controlling over a scenario or situation.
The existing situation or condition
Used to talk about a situation which begins to worsen