Chasing Killers in the Border City

What could be more terrifying than a killer hiding in the shadows?

The girl who would do anything to marry him turns out to be the murderer of his father? The relatives hunting him down are actually the ones who saved his life?

Reeling from one devastating blow after another, Zhao Biancheng rescues an amnesiac girl and obtains intelligence about the Black Wolf. Keeping half of his master's dying words in mind, he goes undercover to investigate, only to be locked in a flooded dungeon and pushed to the brink. At the critical moment, code-breaking expert Li Yunhe fights alongside him in the wolves' den. They pursue their quarry to the border and charge into a cave, risking their lives to capture the Wolf Head, the culprit behind a string of murders spanning many years, and avenge their blood feud.

Hero: A master of flying spikes who makes arrests faster than a bullet!

Heroine: She solves crimes through microexpressions, precise and fearless!