In the middle of the 21st century, due to the greenhouse effect, the glaciers in the Arctic and Antarctic melted, and many cities on the earth were submerged. At this time, human technology has been highly developed. Artificial intelligence robots are one of the technological means invented by humans to cope with the harsh natural environment. Moreover, robot manufacturing technology has been highly developed. Advanced robots not only have a lifelike human appearance, but also can sense their own existence. Monica's son Martin is seriously ill and hospitalized, and his life is in danger. In order to ease the pain, she adopted a robot child David (Haley Joel Osment), and David's survival mission is to love her. Martin woke up, recovered, and returned home. A series of things made David "fall out of favor" and was finally abandoned by Monica. After escaping the cruel pursuit of the robot slaughterhouse, David, with the help of his robot lover Joe (Jude Law), began to look for his own survival value: he longed to become a real child and return to Monica's mother. No one knows whether he can fulfill his wish and become a real person. What awaits them is only an unpredictable journey...