On rainy nights in Jiangcheng, murders occurred one after another.
She is a calm and restrained female forensic doctor who reads the truth from the bones and scars. With a scalpel, she cuts through the layers of blood stains of the CB criminal group.
He is an avenger hidden in the darkness, carrying a family full of blood feuds, and single-handedly hunts down the top evil in this city.
An unknown skeleton sunk at the bottom of the river, a series of murders that lasted for five years, and a "sir" behind the scenes who only heard about the code name but never saw his person.
They met again because of the murder, and stood side by side because of the truth. They fought back to back in the pursuit and trap.
He said: "I'm here, you just do the autopsy, I'll take care of the rest."
She said: "I believe in you and the evidence in my hand, which can send everyone to hell."
Walking in the abyss, with the traces of sin as evidence.
His obsession is revenge, and her peace of mind is her return.
And they are each other, the only light that refuses to be extinguished in the darkness.