Du Feng, an outstanding student at the Yun'an Provincial Police Academy, sees his beloved mysteriously die during a graduation examination. Two years later, a series of baffling deaths strikes Yun'an Province. Bian Xue, director of the provincial Public Security Department, orders the formation of Special Case Unit 406. Liu Qi, a psychology professor at the Yun'an Police Academy, strongly recommends Du Feng for the team.
The team includes top special forces soldier Du Ao as its leader; China's Sherlock Holmes, Du Feng; Zhang Jingtao, an instructor of the armed police force; the alluring Miaojiang descendant Pan Diemeng; trace evidence expert and microexpression specialist Wu Chaofei; top hacker and hardcore gamer Chen Yeli; and the cold-blooded sharpshooter Xia Yuandong. One horrifying case after another comes their way: seductive uniforms, bloodthirsty white wax, a courtesan, and a human-body jigsaw puzzle. The Public Security Department's finest gather in the special case unit to dispel the fog, uncover the truth, and expose the wicked hearts hiding behind the pursuit of profit. A mysterious figure in black appears and vanishes, while memories of two years ago lie shattered. With the help of his teammates, can Du Feng uncover the truth about what happened back then? Can he also awaken the hidden mystery of his past, buried deep within his memories?
