Chen Da Tiao, who has been misunderstood by the world, is actually an undercover "grey man" who has been lurking for many years. In order to dismantle the "Black Triangle" criminal group, he sneaked into the center under the guise of a fool, disrupted the balance of power with reckless but precise methods, collected evidence amidst suspicion and temptation, and triggered internal strife. Faced with a deeper conspiracy behind the scenes, with no reliable help around him, and even his identity almost exposed, can this lonely duel tear through the darkness and protect justice?
