The unjust case of the fire in Apartment 407 that had been buried in the dust for three years has been revived with a broken button left in the crack as a breakthrough. Interpol Lu Chen insists on tracking down loopholes in the file, and unexpectedly breaks into a layer-by-layer dark dead end, uncovering the deliberate murder behind this seemingly accidental fire. At that time, the four participants each performed their own duties, worked together to close the loop on the crime, relied on their power and connections to weave a dark web, and got away with it for three years. But the alliance maintained by interests has long been hidden, and the behind-the-scenes plotters are dormant and counterattacking. The former masters and disciples turned against each other, and their cronies drew swords against each other. Lu Chen and his partner Shen Que were dragged into a dark fight in a multi-party game, and became pawns pulled between good and evil. He does not believe in the overwhelming power and does not recognize the predetermined outcome. Relying only on fragmentary physical evidence and extreme rationality, he tears through the layers of disguise within the system and dismantles years of conspiracies. In the countdown to life and death, he tracks down the fourth piece of irrefutable evidence and uncovers the monstrous truth that has been buried for three years.
