Classmates for four years, on the eve of graduation, a close friend suddenly disappeared from the world, and everyone around him kept silent. It seems that a close friend has never appeared before. In order to find the truth, he engaged in criminal police work and began investigations. Years later, in a murder case, his best friend appeared again, and a suspect was released on bail. When I met Que again, I found that the other party had changed his temperament and set foot in the gray area. The former close friends are now at odds, and the two have begun to fall into a battle between good and evil. In the game of one case after another, the fog of truth is gradually removed.