Legend has it that in ancient times there was an animal called "greed". It has a big appetite. It eats everything and never gets tired. When it saw the sun, it also wanted to eat it, so it jumped into the sky with all its strength. The sun was touched by it, but it didn't eat it, but burned itself to ashes. Since then, this animal has disappeared. What is left is the idiom that people often say; Greed, greed, etc.