A flawless crime, serial murder case without suspect is investigated. An outstanding case forced the police and criminals to work hand in hand, go deep into the murder scene and compete with the murderer to get justice for the deceased. The two heroes teamed up to fight each other, but the undercurrent of the devil's deal was surging, and it was about to trigger another wave of an even greater crisis! Adapted from the novel "The Pursuer" (追凶者) by Qian Yu Zhi Cheng (千羽之城).