"Are you game for a high-stakes gamble?"
"The kind where winning is pure ecstasy, and losing hurts like hell!"
Fate is a gamble. When it comes knocking, he has no idea it is merely bait luring him into the depths of hell—forcing him to witness the darkness hidden beneath civilized society, and to face his own violent instincts.

Following his success in cracking the Liuzhangli serial murders and the Cailiao cold-case homicides, Wu Cheng is hired as a consultant for the Ultimate Care Detective Agency. When he isn't hanging around teahouses and cafes shooting the breeze with his boss, Hu She, dreaming of a massive case falling into his lap, he lives a reclusive life in the woods along Zhuangzi Creek.

One day, news breaks of an outrageous sexual assault case that sparks public fury. Unable to suppress his deeply empathetic nature, Wu Cheng teams up with his sharp-witted partners at Ultimate Care, launching a series of undercover operations. Unexpectedly, a mysterious woman steps in to help. From the moment she appears, she leaves an indelible mark on Wu Cheng, yet she adamantly refuses to reveal her real name. Can she truly be trusted?

On the night of the operation, he catches the cold, lethal glint in her eyes—swift, ruthless, and unyielding as she extorts the villains. Cast into a fog of uncertainty, good and evil, morality and corruption, wage an endless tug-of-war in his mind.