Zhong Fan, a security guard in an ordinary office building, watches white-collar workers coming in and out every day, silently taking note of everyone's habits. He kept a low profile and never had conflicts with others, until one day he saved the female CEO who was being hunted and revealed his amazing skills. It turns out that he is the ace member of the spy organization "Ghost" that once shocked the world, code-named "Thousand Faces". During a mission, he was betrayed by the organization and his family was killed. He concealed his name and went deep behind enemy lines. Now, he disguises himself as a security guard just to find out the truth behind the family's destruction. When his enemies surfaced one by one, he no longer hid, and used his identity as a security guard to deal with the black and white in the city, using his wisdom and skill to make all betrayers pay the price. But he didn't expect that a bigger conspiracy was unfolding, and he was the only one who could stop it.
