“Already Know” is the lead single from Mook’s third mixtape, Cash Route (later released on September 19, 2018).

The single was released on August 10, 2018, the day of what could’ve been the release of his aforementioned third tape, due to a studio production error.

The song, co-written by Boss Beezy, had been previewed on April 29, 2018.

It was later heard again during a promotional trailer for Cash Route.