A murder mystery that follows a cat-and-mouse relationship between a relentless detective and his equally clever former classmate who's protecting the guilty.

Cop-turned-security guard Ma Xianyong finds himself in a criminal twilight zone when two unrelated events turn his world upside down. The mysterious disappearance of his boss has implications for his financial security. Even more perilous is the abduction of his paralyzed sister who, unknown to Ma, makes a morbid deal with her captors.

A murder mystery that follows a cat-and-mouse relationship between a relentless detective and his equally clever former classmate who's protecting the guilty.