The Remnants of the Ash Ruins, I Am Back with the Weapon Master.

Four thousand years after the extinction of mankind, she is the last pure human in the universe. After hiding in the depths of the wasteland for two thousand years, she thought she would only rot alone in the remains of the old era. Until that day, Jin Xu, the coldest prince of the Mechanical Empire, stood outside the ruins where she was hiding and told her in a low voice: "Don't come out. Hide." He is the future emperor of machine civilization, and he is the imperial weapon who was born to hunt her, dismantle her, and study her. But he violated the imperial rules time and time again, erasing her traces, sending her supplies that humans had long since extinct, and even willing to bet his position as heir for her. Wan Yu thought that he had met the only exception in four thousand years of desolation. Until that day, the dragnet fell. She was sent to the highest laboratory of the empire and saw Jin Xu standing next to the mechanical emperor, indifferent and indifferent, as if he had never known her. Vivisection, gene extraction, and the complete end of human civilization. She died with overwhelming hatred, and when she opened her eyes again, she had been transformed into the only high-level mechanical body in the universe. This time, she was no longer the last human being shivering in the ruins. She is the [Human Soul Weapon Lord] reborn with human soul, memory, emotion and civilization heritage. She's back with a vengeance. The first person to be killed was the prince of the empire, Jin Xu, who had secretly protected her but then pushed her into hell with his own hands. But she didn't know that the arrest was never his intention. From beginning to end, he was deceived by his father. Years later, the truth was revealed. Humanity disappeared in four thousand years of time and space. But the last tenderness, memory, and embers of human beings are reborn, established, enshrined, and exist forever in the cold mechanical galaxy.