Vengeance

A killer is on the loose. The CPD (Criminal Pursuit Division) gets involved after one murder after another that is similar on another particular day. These murders are not killed with a knife or gun, but by being beaten to death. With no DNA, with no lead to the killer, they need help from the best detective they know-- Detective Wu Jing. However, he retired due to his depression from his deceased sister and his brother in prison for a crime he did not commit. Wu Jing blames these incidents on the CPD as they were the ones who put his brother in prison. The CPD current detective, Jennifer Mathews, was appointed to bring Wu Jing back by "any means necessary, but alive." Wu Jing accepted the case with the CPD but on one condition: to release his brother from prison.