One is a monster that is said to be hidden in the Four Heavenly Kings. If the four beasts are disasters of the human world, then these four monsters are disasters of the gourmet world and the human world! Textual research shows that when Aru started eating, the Red Monster appeared and talked with Aru, which shows that he is wise and can be accepted as a disciple by Yi Long, the strongest man in the world. It is normal to have this ability.
These materials are all conclusions reached with good people in forums such as post bars, and the credibility is quite high.