Jennifer Lopez isn’t sure if she’s a good cop or a bad cop.

Lopez unveiled the trailer for her upcoming cop drama Shades of Blue Sunday on Facebook, giving a first look at her morally conflicted character, Harlee Santos. A Brooklyn detective and single mom, Santos is convinced to go undercover as an FBI informant to protect her daughter. Ray Liotta plays her boss, Lt. Matt Wozniak, who would do anything to protect his team — which includes hunting down the identity of the informant.

Barry Levinson, who won an Oscar for directing Rain Man, directed the pilot, and Shades of Blue received a straight-to-series order of 13 episodes last year. “So proud of Shades of Blue,” Lopez wrote on Facebook. “Can’t wait for you to see it.”

Shades of Blue is set to air this January on NBC. Watch the trailer below.