Tong Bang, a modern agricultural researcher, accidentally traveled through the Daqi Dynasty and became an inconspicuous worker in the Forensic Department of the capital. With the accumulation of knowledge that surpassed the times, he gradually became the most famous forensic expert in the capital. He only wanted to rely on his crafts to save money to buy farmland on the outskirts of the city and live a stable life, but he was accidentally involved in a serial suicide mystery. Seven murder cases disguised as suicides were arranged perfectly, except for the flaw of deliberately erasing finger marks. This illogical detail aroused suspicion in Tong Bang, who was almost paranoid about the truth. When the name of the last deceased person appeared, Tong Bang was completely shocked - it was the girl Su Awan who narrowly escaped with evidence of a murder case he handled five years ago. The old case five years ago was connected with the current serial murder case, and Tong Bang discovered that he had already fallen into a well-woven conspiracy. His action of letting the girl escape back then was actually a well-calculated step in the conspiracy. In order to cover up his crimes of corruption and murder for many years, Wei Yong, the imperial master of the dynasty, bribed the senior officials of the Forensic Department to obstruct Tong Bang's investigation of the case. Rumors spread that he had received benefits from the murderer for personal gain, and even his once-trusted colleagues were full of suspicion towards him. He has no authority to mobilize the troops of the imperial city, so he can only rely on his keenness in detecting traces to find clues in the many obstacles. Every step closer to the truth brings more threats around him. His opponents are always faster than him in destroying traces, and even pour dirty water on him, making him a wanted fugitive in the capital.
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