UPDATED: Jennifer Lopez took to Facebook today to premiere the first full trailer for Shades Of Blue, the star’s crime drama bowing January 7 on NBC. The premiere date was moved up a week from originally announced January 14. No word from NBC about why the premiere was moved up, but audiences tend to come back strong the week after the first of the new year. NBC also will have the benefit of the crossover episodes of Chicago Fire, Chicago P.D. and Chicago Med earlier that week to promote the Shades premiere.

Lopez plays Harlee Santos, an FBI agent (and single mom) assigned to an anti-corruption task force. The series, created by Adi Hasak, costars Ray Liotta. The clip opens with Lopez’s Santos appearing to shoot her partner, though obviously appearances are deceiving. The trailer does establish what likely will be the central conflict of the series: Santos’ torn feelings about spying on her coworkers and her emotional allegiance to Liotta’s hard-driving boss character. “There’s a rat!,” he yells. “A Rat! An FBI informant on my team!” As for the show’s title, the tag line explains it: “Between good cop and bad cop…there are shades of blue.” Check it out.