South Korean rapper Zico is under fire from Chinese netizens after an old track has resurfaced, sparking a wave of outrage. | @woozico0914/Instagram The controversy stems from the song “If I Ain’t Got Jj*ng-Gae,” in which Zico uses a derogatory term traditionally used to mock Chinese people. The term Jj*ng-Gae is considered a slur and…