Modern criminal policeman Li Mu traveled through the Tang Dynasty and became the most useless agent in Chang'an County. His salary was withheld, he was called a waste, and he was looked down upon by the girl he had a crush on - until a series of murders occurred in Chang'an City. He used modern criminal investigation techniques to solve cases and used criminal psychology to find out the real culprits. He worked his way from being a detective to becoming the minister of Dali Temple. At that time, the powerful officials wanted to kill him, and the mastermind behind the scenes wanted to silence him, but Li Shimin said to him: I want there to be no more unjust cases in this world.
