Correct
事过境迁
/ shì guòjìng qiān /
Strokes
Definition
The issue is in the past, and the situation has changed (idiom)./It is water under the bridge.
Example
Definition
events have passed and times have changed; the matter is over and the situation has changed; the incident is over and the circumstances are different; there are no birds of this year in last year's nest; the shoe is on the other foot