EXCLUSIVE: Ben Affleck Oozes Gangster Swagger in 'Live by Night,' the First Film He Did After Jen Garner Split

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Ben Affleck wrote, directed and stars in his latest movie, Live by Night, and ET has a first look at the gangster film!

The Oscar winner showcases a full Boston accent to play Joe Coughlin, a cop's son who has gone to the dark side.

PIC: Ben Affleck Looks Totally Retro and Amazing on the Set of 'Live by Night'

The 1920s drama, based on the Dennis Lehane novel of the same name, follows the saga of Coughlin through his rise to power in Boston, his incarceration and release to start over in Florida. It's in the Sunshine State where the once straight-edged U.S. soldier finds himself caught between two rival gangs and two femme fatales played by Zoe Saldana and Sienna Miller.

"I realized to be free in this life breaking rules meant nothing. You had to be strong enough to make your own," Affleck says as Coughlin in the trailer.

Affleck shared pictures from the set when the movie began shooting in Brunswick, Georgia, in October.

WATCH: Ben Affleck Shows Off His Muscles While Grocery Shopping With Jennifer Garner

"First day. First shot," he posted on Instagram.

Shooting for the film started just four months after Affleck's split from Jennifer Garner after 10 years of marriage.

Live by Night, the fourth film directed by Affleck, hits theaters Jan. 13, 2017.