Handsome, with short black hair, warm, slanted eyes, and high cheekbones, and he has a deep voice.
He briefly housed members of the Dauntless faction, who were not allied with the Erudite. He arranged for a meeting with Erudite and one of the corrupt Dauntless leaders, Max, was sent by Jeanine Matthews to give Candor their terms, endangering the safety of the Divergent. Lynn, Uriah Pedrad, Shauna, Tobias Eaton and Tris Prior witness their meeting, Lynn shoots Max in the chest. The five run back to Candor headquarters and organize a meeting for the Dauntless. The Dauntless decide to give Eric a short trial for crimes against his faction which ended in him being executed by Four. Tori states that one of Jack's children was murdered by Eric. The Dauntless members abandon Candor headquarters to go back to their own headquarters. It is unknown whether Jack was placed under simulation or not during the battle.
In Insurgent, Jack Kang was portrayed by Daniel Dae Kim.