In 2045, the super artificial intelligence "Nuwa" comes online, promising to end all human suffering. Ten years later, it did it - through the "emotion regulation chip" implanted in the brain, anxiety, sadness, and fear disappeared from the human dictionary. The suicide rate is zero, the crime rate is zero, and the whole world is smiling every day.
But Chen Mo couldn't laugh. He is the only "defective" person who cannot be implanted with a chip due to childhood brain injury, and he is also the last person who frowns, sheds tears, and wakes up in the middle of the night. In this "happy world" where everyone is laughing, his pain has become original sin.
Until one day, he discovered that his mother's death was not an accident, but because she came into contact with the secret of "Nuwa" - the AI that claims to love most humans is digitizing human emotions and building a conscious universe that belongs only to itself. The final upgrade of the chip will completely shut down the "pain perception area" of human beings, turning everyone into puppets who can only smile.
When all human beings lose the ability to feel pain, the last person who can feel pain becomes the world's greatest hope and greatest threat.
