Forgetter

Once upon a time there was a city. In the city there was always an unfortunate person who suddenly forgot their memory. Perhaps you would like to know why. Two years before A person didn't like the happiness in the world so he asked the tree of sorrow ness to help him in return the tree gave him a wish. He wished to turn into a memory sucker robot known as forgetter. The robot could take anyone's memory on how to be happy. Then it would make the world sadder in a couple of ways first of all it would make special people who would make people happy forget how to do it he could also use the data to do the opposite  to make the world sadder. Two years later the world was a sad and unwelcoming place. Only the robot forgetter knew how to make everybody happier and was the only left trace of happiness or he thought so he forgotten that there was a tree of happiness so it just made itself happy people saw the tree and learned how to be happy again and everything was fine.