Zhang Dongjian

A perfect crime, a serial murder case with no suspect, is investigated. Police and criminals are forced to collaborate, diving into the crime scenes to seek justice. As the two heroes clash, a dangerous undercurrent threatens to spark an even greater crisis. (Source: MyDramaList) ~~ Adapted from the novel "The Pursuer" (追凶者) by Qian Yu Zhi Cheng (千羽之城).