Shen Shen, the Black Crow Division of the Tianheng Empire, was ordered to wipe out Wushenglou, the largest underworld force in the world. However, Leng Wushuang, the owner of Wushenglou, backhanded an old case from seventeen years ago. One is the sharpest knife in the court, and the other is the most dangerous shadow in the world; they were supposed to face each other life and death, but they discovered in old cases that the real murderer had been hiding behind the so-called "right way" and "king's law". Shen Shen, the most cold-blooded Xuanya Si in the Tianheng Empire, was targeted by Leng Wushuang, the most powerful black man in the world. She said she came to kill him, but she kept killing him and protected him as her husband.