Cop and drug dealer team in smooth Korean action flick ‘Believer’

In both Johnnie To’s superb 2012 Hong Kong crime thriller “Drug War” and Lee Hae-young’s fine new Korean remake, “Believer,” a dogged detective infiltrates a narcotics syndicate with the help of a possibly untrustworthy informant. Although they share a premise, “Drug War” is more of a gritty, realistic…