In the 23rd century AD, human civilization was attacked by the "Observer" civilization, and the surface of the earth was reduced to wasteland. The survivors were forced to move to the bottomless underground shelter "New Atlantis". However, the real threat does not come from the stars, but the "pretenders" lurking within humans and capable of perfect mimicry! Forerunner scout Chen Xing accidentally merged with the "Earth Biological Simulation System" after crashing in the Earth's atmosphere, and awakened the heaven-defying "Perfect Mimicry" talent. In order to survive and complete his mission, he was forced to disguise himself as a human and sneak into the dangerous underground city. In the damp and oppressive shelter, the pretenders are pervasive, stealing information, creating chaos, and brewing the "ultimate plan" to subvert human civilization. Chen Xing must use the "behavioral simulation", "emotional analysis" and "evolutionary adaptation" capabilities given by the system to work step by step and fight wits to reveal the truth hidden under the human mask and become the last hope of mankind. But every "evolutionary adaptation" brings irreversible genetic mutations, and a period of weakness and the risk of identity exposure go hand in hand. He must repair the core of the system before the complete mutation, unlock the ultimate secrets of the Forerunners and Observers, and save human civilization on the verge of extinction! This is the ultimate battle of survival, disguise and identity.
