What is Black Commander in Pleasant Goat and Big Big Wolf?

Black Commander, from the strange underground world, is little Sage's younger brother. They have the same mother (a hen). Little Sage once told the sheep to find their mother. As long as he finds his mother, he can beat Black Commander. Later, he learned from his mother that Black Commander was his younger brother. Originally, once I went out with Black Commander, Black Commander was caught by the "black-hearted preserved egg processing factory". As a result, the gene mutation became. At that time, because he did all the bad things, he was sealed in an egg with a hook by the hen, and the result was misplaced by the wolf. He always wears a black hat and cloak.