Tell the story of the Tang dynasty and an ongoing bizarre serial murder. Private spies come to change where the incidents take place and start to remove evil.

Chang'an City in the late Tang Dynasty as the background. The sorehead and cynical Du Gu Zhong Ping was a small painter of Jin Wu Wei on the surface. In fact, the thoughtful, experienced him was an important consultant of detective. The aristocratic young girl, Wei Ruo Zhao, who ran away from home and fled forced marriage, was very clever and gifted with an extraordinary retentive memory, having her heart set on to learn to be a detective from Du Gu Zhong Ping. The bounty hunter, Li Xiu Yi, who came from Luoyang, was a superb martial artist, solitary but having unique insights. These three people got together, competing with and using each other mutually, working together to detect a number of mysteries.—Cyrus Vu