One night I had a dream. I saw a Thunder-man knocking on a door. The owner of the house said: "We are a new generation. So we only allow scientists or doctors to enter the house." There was another door that was locked. The key was not in the owner's hand but someone else's. A robot came out of the last door and said to the Thunder-man: "You are the myth. We don't believe in any religion. Even humans don't exist." So I started writing this book.