In 2025, Lu Chengyan, the king of detectives, was accidentally transported to the ancient times, but his personal system fell into a deep sleep. With his forensic knowledge and trace science skills, he secretly helped his parents solve many unsolved cases. He was privately called the "Little God Detective", but his achievements were always concealed from the outside world.
When he was 18 years old, because he was tired of the county government's perfunctory handling of cases, Lu Chengyan took the reward money he saved and lived in seclusion in the suburbs, just to live a stable life. But the peaceful life was broken by six series of strange cases that broke out in the imperial capital. Frequent murders made people panic, and the emperor was eager to find a hidden person.
The seventh princess Zhao Qingyan, who witnessed the young Lu Chengyan's precise analysis of the case ten years ago, disguised herself as a talent hunter. When passing through the county town, the case of the scholar's drowning happened to be suspended. Lu Chengyan, who went down the mountain to buy pens and ink, casually mentioned "check the silk weave and nail residue", accidentally revealing his strength.
After being invited by Captain Zhou to accompany him, he used modern criminal investigation techniques to solve three strange cases in a row. The seventh princess was even more certain that he was the amazing young man back then. It wasn't until someone wore a blue shirt of the same style and pretended to be innocent that he was blamed. Lu Chengyan was shocked to realize that all the small cases were connected to the big cases in the imperial capital, and there was a conspiracy to shake up the court behind them.
In order to find the real culprit and protect the people around him, the retired detective finally said, "Go to the imperial capital." The confrontation between modern criminal investigation and ancient tricks and power struggles in the court began.
