A rare and huge earthquake tore the ground apart, greedily devouring countless lives like a monster. A young man was buried under the rubble, helpless and desperate. Just when he was dying, a crack appeared in the darkness above his head. While breathing freely, the boy also saw a "steel giant" that did not belong to that era. Several years later, the pain of the disaster seemed to have disappeared from people's sight, but the boy continued to search for the majestic figure of his youth and the secret given to him by the disaster in college. However, he did not want to because of the fire in the robot club, the "mechanical feet" that had been hidden were discovered by his mentor Han Zifang. After the earthquake that year, an officially banned human experiment of integrating machinery and the human body gradually surfaced. As a survivor of the human experiment that year, the boy was involved in one bizarre incident after another. People and events, both good and evil, are intertwined, and the secret truth seems to be far away. The mechanical legion seems to be behind the fog of reality, but who is the real manipulator behind it... With the emergence of a mysterious organization's terrorist attack, the war is about to break out. The military dug deep but could not find the real leader of the mysterious organization. The mystery of the headless snake finally moved people's realization to space. It turns out that the mysterious organization and the mysterious power behind it want to destroy not only peace, but humanity itself.
